Chemistry exam – MU Sofia Exam preparation

Welcome to your Chemistry exam

25. With addition of a catalyst to a system at equilibrium :

(A) the point of equilibrium is shifted to the right.

(B) the point of equilibrium is shifted to the lefl.

(C) the forward and reverse reactions rates are increased unequally.

(D) the forward and reverse reactions rates are increased equally.

23. The chemical elements presented are arranged in order of decrease in their reactivity, according to the activity series of metals. $Ca$, $Na$, $Mg$, $Zn$, $Fe$, $H$, $Cu$, $Hg$, $Ag$, $Au$ Which is the best reducing agent, which is oxidized the easiest?

(A) $Ca$

(B) $Au$

(C) $H$

(D) $Fe$

22.The hydroxonium ion is represented as :

(A) $H_2O{^+}$

(B) $H_3O{^+}$

(C) $HOH{^+}$

(D) $H{^-}$

19. Oxidative-reductive processes could be:

(A) intermolecular

(B) intramolecular

(C) disproportionation

(D) all answers are correct

97. In the presence of a catalyst the chemical equilibrium shifts:

(A) in the direction of the direct reaction

(B) in the direction of the reverse reaction

(C) in the direction of the exothermic reaction

(D) does not shift

28. How many times the rate of the reaction $2NO$+$O_2$ → $2NO_2$ will increase if the concentration of all substances is increased two times?

(A) 16 times

(B) 8 times

(C) 6 times

(D) 4 times

16. 10 moles of benzene contain :

(A) $10$ benzene molecules;

(B) $22.4$ benzene molecules;

(C) $6.02 x l0^{24}$ benzene molecules;

(D) $6.02 x I0^{23}$ benzene molecules;

1. The electronic configuration of $Cu^{2+}$ iron is:

(A) $3d^74s^2$

(B) $3d^84s^1$

(C) $3d^94s^0$

(D) $3d^104s^1$

9. Hydrogen may NOT be obtained by :

(A) interaction of zinc and hydrochloric acid;

(B) interaction of sodium and water;

(C) interaction of copper and nitric acid;

(D) electrolysis of water;

10. The industrial process of production of sulfuric acid includes the following Stages :

(A) production of hydrogen sulphide, oxidation of $H_2S$ with ozone, dissolving the obtained product in water;

(B) production of $SO_2$, catalytic oxidation to $SO_3$ and interaction of $SO_3$ with water;

(C) displacement of $H_2SO_4$ from its salts with nitric acid and distillation:

(D) preparation of a mixture of sulfur chlorides and oxidation of the resulting compounds with ozone;

18. In oxidative-reductive processes the oxidizing agent:

(A) increases its oxidation number

(B) decreases its oxidation number

(C) loses 1 electron and decreases its oxidation number

(D) gains 1 electron and decreases its oxidation number

60. From the fact that two aqueous solutions of glucose and sucrose have the same osmotic pressure, it can be concluded that the solutions are:

(A) electrically conductive

(B) hypertonic

(C) hypotonic

(D) isotonic

41. A colloid of $Al(OH)_3$ with posetively charged granules coagulates with the addition of a certain amount of electrolyle. Which of the listed electrolytcs, on equal terms (concentration, volume), will cause the fastest coagulation?

(A) $(NH_4)_2SO_4$ ,

(B) $Al_2(SO_4)_3$ ,

(C) $MgSO_4$ ,

(D) $NaCl$ .

21. When nonspontaneous redox reactions occur by use of a direct electric current, the process is called :

(A) neutralization

(B) electrification

(C) electrolysis

(D) hydrolysis

39. Indicate the wrong statement :

(A) the equilibrium constant depends on the presence of catalysts;

(B) the equilibrium constant does not depend on the concentrations of the reactants:

(C) the equilibrium constant does not depend on the pressure;

(D) tbe equilibrium constant depends on the temperature.

37. Henri's law is followed when :

(A) there is no chemical interaction between the dissolving gas and the solvent;

(B) there is chemical inreraction between the dissolving gas and the solvent;

(C) the temperature is increased;

(D) the temperature is decreased.

33. The azimuthal quantum number :

(A) considers the differences in the shape of the electronic clouds,

(B) increases with the energy of the individual states,

(C) is marked with 1 and adopts integer values,

(D) all answers are correct.

26. The chemical reaction $2Cl_2$ + $H_2O$ ⇄ $O_2$ + $4HCl$ is in chemical equilibrium.The rate of the forward reaction is :

(A) equal to zero

(B) equal to the rate of the reverse reaction

(C) lower than the rate of the reverse reaction

(D) higher than the rate of tbe reverse reaction

13. Chlorine CANNOT be obtained:

(A) from hydrochloric acid and potassium permanganate;

(B) through electrolysis of water solution of calcium chloride;

(C) by interaction of hydrogen chloride with potassium chlorate;

(D) by interaction of sodium chloride with concentrated sulphuric acid;

6. Which is the correct order of halogen ions with decrease of reductive properties?

(A) $F^- , Cl^- , Br^- , I^-$

(B) $I^- , Br^- , Cl^- , F^-$

(C) $F^- , I^- , Br^-, Cl^-$

(D) $Cl^-, I^-, Br^-, F^-$

44. what is the pH value of 0.01 M solution of $HCl$ :

(A) 0.01,

(B) 1,

(C) 2,

(D) 10.

34. Finding the permitted states of electrons :

(A) is done with the help of Hund's rule,

(B) is done with the help of Pauli's principle,

(C) is done with the help of the principal quantum number,

(D) all answers are wrong,

49. Which statement about the four quantum numbers which describe electrons in atoms is INCORRECT ?

(A) $n=$ principle quantum number, $n = 1,2,3.........$

(B) $l =$ subsidiary or azimuthal quantum number, $l=1, 2 , 3, ..., (n+1)$

(C) $m_t =$ magnetic quantum number, $m_t = (-l), ... , 0,... , (+l)$

(D) $m_s =$ spin quantum number,$ m_s = +1/2$ or $-1/2$

42.The foam is a system of:

(A) liquid dispersed in gas,

(B) gas dispersed in liquid,

(C) liquid dispersed in liquid,

(D) solid dispersed in liquid.

108. State the process in which a metal undergoes reduction:

(A) decomposition of aluminum hydroxide

(B) decomposition of zinc dinitrate

(C) reaction of potassium hydride with water

(D) reaction of copper (II) oxide with hydrogen during heating

56. In which of the indicated pairs there is NO correspondence between the chemical formula and the name of the substance?

(A) $N_{a2}O_2$ — disodium oxide

(B) $N_{a2}SO_3$ — disodium sulfite

(C) $C_aCO_3$ — calcium carbonate

(D) $C_aSO_a$ — calcium sulfate

27. Hydrogen peroxide is easily decomposed to water and oxygen according to the reaction $2H_2O_2$→$2H_2O$ + $O_2$. Its stability is increased in the presence of $H_3PO_4$ :

(A) $H_3PO_4$ is positive catalyst and the catalysis is heterogeneous.

(B) $H_3PO_4$ is positive catalyst and the catalysis is homogeneous.

(C) $H_3PO_4$ negative catalyst and the catalysis is heterogeneous.

(D) $H_3PO_4$ negative catalyst and the catalysis is homogeneous.

29. The reaction of a multistage reaction is determined by :

( A) the rate of the first stage

(B) the rate of the last stage

(C) the rate of the fastest stage

(D) the rate of the slowest stage

48. On combustion of ammonia, the nitrogen is converted to :

(A) $NO$

(B) free $N2$

(C) $NO_2$

(D) ammonia cannot be oxidized

32. The principal quantum number :

(A) is marked with n and adopts integer values,

(B) is associated with the energy of the electron,

(C) is related to the size of the electronic cloud,

(D) all answers are correct.

36. The equilibirium constant of a given reaction depends on:

(A) the concentrarion of the reactants

(B) the presence of a catalyst

(C) the concentration of the reactants and presence or catalysts

(D) the nature of the reactants and the lemperature

50. If reaction A has an activation energy of 250 kJ and reaction B has an activation energy of 100 kJ, which of the following statements MUST be correct ?

(A) If reaction A is exothermic and reaction B is endothermic then reaction A is favored kinetically.

(B) At the same temperature the rate of reaction B is greater than the rate of reaction A.

(C) The energy of reaction A must be greater than the energy of reaction B.

(D) The energy of reaction B must be greater than the energy of reaction A.

47. For manufacture of nitric acid two oxides are used :

(A) $ N_2O$ and $NO$

(B) $NO$ and $N_2O_3$

(C) $N_2O_3$ and $NO_2$

(D) $NO$ and $NO_2$

15. At two fold increase of the pressure, the rates of the straight and the reverse reaction of the system $A(g) + 2B(g)$ = $AB_2(g)$ are changed accordingly:

(A) straight - increased 8 times, reverse - slowed down 2 times;

(B) straight - increased 8 times, reverse - increased 4 times;

(C) straight - increased 16 times, reverse-increased 8 times;

(D) straight - increased 8 times, reverse - increased 2 times;

35. Which statement for an equilibrium system is true:

(A) the rates of the straight and the reverse reactions are equal

(B) the concentrations of the reactants are equal to the concentrations of the products

(C) the concentrations of the reactants and the products are changed by addition of the catalyst

(D) the concentrations of the reactants and the products does not change with change in the temperature

71. In which of the transitions is there a conversion that is NOT possible?

(A) $N_a → N_aOH → N_{a2}CO_3 → NaHCO_3$

(B) $S → SO_2 →SO_3 → H_2SO_4$

(C) $Cu→CuO → Cu(OH)_2 → CuSO_4$

(D) $Ba→ BaO →Ba(OH)_2 → BaSO_4$

14. Increasing the pressure in an equilibrium system containing gas molecules leads to the withdrawal of the chemical equilibrium in the direction of the reaction:

(A) flowing with heat absorption;

(B) flowing with heat release;

(C) flowing with decrease in the gas molecules number;

(D) flowing with increase in the gas molecules number;

12. Mark the line which includes only salts, whose water solutions are basic :

(A) sodium carbonate, potassium sulphite, potassium phosphate;

B) iron (ΙΙΙ)nitrate, potassium hydrogen carbonate, copper sulphate;

(C) iron (ΙΙΙ)chloride, sodium sulphide, barium acetate;

(D) copper nitrate, iron (ΙΙΙ)bromide, magnesium sulphate;

55. At constant temperature, an aqueous solution of glucose with concentration of 1 mol/L compared to water has:

(A) higher vapor pressure

(B) higher osmotic pressure

(C) lower boiling point

(D) higher freezing point

54. Which of the following substances is an electrolyte?

(A) $C_2H_6$

(B) $C_6H_12O_6$

(C) $C_2H_5OH$

(D) $CH_3COOH$

46. The maximal oxidation state of the atoms of chemical elements is equal to :

(A) the number of the period in which is the element in the periodic table

(B) the number of the group in which is the element in the periodic table

(C) the number the element in the periodic table

(D) any possitive integer number

30. The chemical elements of Group ΙB have :

(A) 1 electron in their outermost electronic shell,

(B) 18 electron in their outermost electronic shell,

(C) 2 electron in their outernost electronic shell,

(D) all answers are correct,

20. The oxidation number for hydrogen in $NaH$ is :

(A) +1

(B) +2

(C) 0

(D) -1

51. In which row against the type of the chemical bond is a suitable listed example?

(A) covalent non-polar, simple bond -$N_2$

(B) covalent polar, triple bond -$NH_3$

(C) covalent polar, simple bond -$H_2O$

(D) covalent non-polar, double bond -$Br_2$

24. The cathode in an electrochemical cell is the electrode that is

(A) the electrode where oxidation takes place

(B) always positive

(C) always neutral

(D) the electrode where reduction takes place

61. The mass of the solute and the mass of water in 150 g of an aqueous solution of potash ($K_2CO_3$) with a mass fraction of 5% are, respectively:

(A) 6,5 g $K_2CO_3$ and 143,5 g $H_2O$

(B) 7,0 g $K_2CO_3$ and 143,0 g $H_2O$

(C) 7,3 g $K_2C_O3$ and 142,7 g $H_2O$

(D) 7,5 g $K_2CO_3$ and 142,5 g $H_2O$

4. What is the ground electronic state of $Mn^{2+}$:

(A) $1s^2 2s^2 2p^6 3s^2 3p^6 3d^5 4s^2$

(B) $1s^2 2s^2 2p^6 3s^2 3p^6 3d^3 4s^2$

(C) $1s^2 2s^2 2p^6 3s^2 3p^6 3d^5$

(D) $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 4p^3$

45. An aqueous solution of a salt has pH 9. Thus it follows that this is a salt of :

(A) strong acid and strong base

(B) strong acid and weak base

(C) weak acid and strong base

(D) weak acid and weak base

11. Which of the presented reactions is NOT oxidative-reductive?

(A) interaction of iron with hydrochloric acid;

(B) burning of methane in the presence of oxygen;

(C) interaction of nitrogen with hydrogen;

(D) interaction of calcium hydroxide wirh sulphuric acid;

17. In oxidative-reductive processes the reducer :

(A) increases its oxidation number

(B) decreases its oxidation number

(C) loses 1 electron and decreases its oxidation number

(D) gains 1 electron and decreases its oxidation number

40. How the degree of electrolyte dissociation $(a)$ and the dissociation constant $(K_D)$ of solution of $HCN$ will change upon increasing its concentration:

(A) $a$ decreases, $K_D$ is not changed,

(B) $a$ increases, $K_D$ decreases,

(C) $a$ decreases, $K_D$ increases,

(D) $a$ and $K_D$ do not change.

52. The crystalline substance X is very soluable in water, it melts when heated, and its aqueous solution does NOT conduct electricity. Substance X can be:

(A) table salt

(B) glucose

(C) calcium carbonate

(D) slaked lime

64. Hydrogen is released during which reaction:

(A) $C_uO_{(s)}) + 2HCl_{(1)}→$

(B) $Na_{(s)} + HCl_{(1)}→$

(C) $Ca_{(s)} + 10HNO_{3(1)}→$

(D) $K_2S_{(1)} + H_2SO_{4(1)}→$

65. The kinetic equation of the reaction $2CO_{(g)} + O_2_{(g)} > 2CO_{2(g)} + Q is:

(A) $v= k.c^2 (CO_2)$

(B) $v=k.c^2 (O)$

(C) $v=k.c(CO).c(O_2)$

(D) $v=k. c^2 (CO).c(O_2)$

43. lf to an aqueous solution of $HCN$ is added $NaOH$ the degree of electrolyte dissociation $(a)$ for $HCN$:

(A) does not change,

(B) initially decreases and then increases,

(C) decreases,

(D) increases.

68. If a salt crystal is placed in a glass of an aqueous salt solution and the size of the crystal does not change over time it can be concluded that the solution is:

(A) saturated

(B) supersaturated.

(C) unsaturated

(D) diluted.

66. During the hydrolysis of salts, heat is absorbed, which means that the process is:

(A) exothermic and the heat effect is denoted by -Q

(B) exothermic and the heat effect is denoted by + Q

(C) endothermic and the heat effect is denoted by -Q

(D) endothermic and the heat effect is denoted by + Q

76. Which of the following oxides is the only anhydride of nitric acid?

(A) $NO$

(B) $NO_2$

(C) $N_2O_4$

(D) $N_2O_5$

99. The rate constant depends on:

(A) the temperature

(B) the presence of a catalyst

(C) the nature of the reactants

(D) all of the above factors

113. Ammonia is passed through a solution of nitric acid, resulting in substance A. A concentrated solution of potassium hydroxide is then added to it on heating, resulting in substance B. Nitrogenous substance B is:

(A) ammonia

(B) nitric oxide

(C) potassium nitride

(D) ammonium nitrate

70. When the concentration of carbon monoxide doubles the rate of the chemical reaction: $2CO_{(g)} + O_{2(g)} → 2CO_{2(g)} + Q$:

(A) decreases

(B) initially decreases and then increases

(C) does not change

(D) increases

63. When AgNO3w is added to an aqueous solution, a white precipitate is obtained. This indicates the possible presence of:

(A) $S^{2-}-ions$

(B) $I^- - ions$

(C) $Br^-- ions$

(D) $CI^- ions$

102. Which two ions have the same electron configuration?

(A) $Ba^{2+}$ and $Sr^{2+}$

(B) $Mg^{2+}$ and $F^-$

(C) $Cu^{2+}$ and $Zn^{2+}$

(D) $Br^-$ and $I^-$

69. What is substance X in the transition $Ca(HCO_3)_2 → X → CaO$?

(A) $CaH_2$

(B) $CaCO_3$

(C) $CO_2$

(D) $Ca(OH)_2$

104. Which of the equations expresses a stage of the synthetic scheme for the industrial production of nitric acid?

(A) $N_2O_5 + H_O→ 2HNO_3$

(B) $N_2 + O_2 ⇄ 2NO$

(C) 4$NH_3 + 5O_2→ 4NO + 6H_2O$

(D) $2NO_2 + H_2O → HNO_3 + HNO_2$

73. Nitrogen is NOT characterized by interaction with:

(A) metals

(B) oxygen

(C) water

(D) hydrogen

67. If the pressure in the equilibrium system is lowered: $CO_{2(g)} + C_{(s)} ⇆2CO_{(g)}-Q$ then:

(A) $c(CO)$ increases

(B) $c(CO_2)$ increases

(C) $c(CO_2)$ and $c(C)$ increase

(D) $c(CO_2)$ increases, and $c(CO)$ decreases

83. Which of the numbers shown below has a value closest to the pH of a sodium base solution with a concentration of 10% mol/l?

(A) 11.5

(B) 5.5

(C) 10.2

(D) 12.5

57. Interaction does NOT occur between aqueous solutions of:

(A) $C_aCl$ and $K_2CO_3$

(B) $C_aCO_3$ and $HCl$

(C) $CuSO_4$ and $N_aOH$

(D) $CuSO_4$ and $N_aCl$

93. What is the electric charge of the pellet:

(A) the granule has no charge

(B) matches the charge of the counterions

(C) coincides with the charge of the ions adsorbed on the nucleus

(D) all of the answers are correct

75. Which electron subshell in the lanthanides is NOT completely filled?

(A) 4f

(B) 4d

(C) 5f

(D) 5g

77. The basic salts are obtained after:

(A) incomplete neutralization of polybasic acids

(B) incomplete neutralization of multivalent bases

(C) interaction of equivalent amounts of acids and bases

(D) hydrolysis of salts

72. Solutions of sulfuric acid and dipotassium sulfate can be distinguished by:

(A) the color change of the litmus

(B) the interaction with calcium dinitrate solution

(C) the reaction with barium dichloride solution

(D) the reaction with hydrochloric acid solution

107. In a closed equilibrium system at constant pressure and temperature, oxygen, carbon dioxide and carbon monoxide are found. The temperature in the system rises sharply and then remains constant. State what will be observed in the system if the reaction between oxygen and carbon monoxide is exothermic: A) the amount of oxygen will increase; B) the amount of carbon monoxide will decrease; C) the amount of carbon (IV) oxide will decrease; D) the total amount of molecules will increase.

(A) A, C, D

(B) A, B

(C) D

(D) A, C

114. Bromine reacts with all substances in the order:

(A) $NaOH, O_2, Hg$

(B) $K, Pt, HCI$

(C) $C_2H_6, Nal, Zn$

(D) $C_2Cl_6, Cu, HI$

81. Specify the color of the flame of potassium salt:

(A) yellow

(B) green

(C) violet

(D) red

111. Which of the reactions is NOT a redox one?

(A) $(CuOH)_2CO_3 →2CuO + CO_2 +H_2O$

(B) $Na_2SO_3 + H_2O_2→ Na_2SO_4 +H_2O$

(C) $NaH + H_2O → NaOH + H_2$

(D) $5K_2S + 8KMnO_4 + 12H_2SO_4 → 9K_2SO_4+8MnSO_4+12H_2O$

98. How can the value of the degree of electrolyte dissociation (a) be increased for a solution of the weak electrolyte $CH_3COON_a$:

(A) by adding water

(B) by adding $CH_3COON_a$

(C) by lowering the temperature

(D) there is no correct answer

80. What is the reaction of the medium of the aqueous solution of the salt $NH_4Cl$:

(A) acidic

(B) basic

(C) weakly basic

(D) neutral

94. Which of the reactions will not produce hydroxide:

(A) $K+ H_2O→ $

(B) $N_{a2}O + H_O→$

(C) $B_aO + H_2O→$

(D) $C_uO + H_2O →$

89. Which of the following interactions does NOT occur?

(A) chlorine and water

(B) chlorine and sodium base

(C) magnesium and hydrochloric acid

(D) magnesium and caustic soda

84. Which answer consists of salts whose aqueous solutions have a pH close to neutral?

(A) $(NH_4)_2CO_3, CH_COONH_4$

(B) $K_2S, K_2SO_3$

(C) $NH_4Cl, Al_2(SO_4)_3$

(D) $CuSO_4, NH_4NO_3$

59. The rate of a chemical reaction $Fe_{(s)}+H_2SO_{4{(1)}}FeSO_{4{(1)}}+H_{2{(g)}}$ does NOT depend on:

(A) the pressure

(B) the temperature

(C) the contact surface of the iron

(D) the molar concentration of $H_2SO_4$

53. In which pair of substances is the oxidation number of carbon -4 and +4 respectively?

(A) $CO_2, H_2CO_3$

(B) $CH_4, CaCO_3$

(C) $Al_4C_3, CH_4$

(D) $CO, N_{a2}CO_3$

92. Which of the statements is false:

(A) according to the Brgnsted-Lowry theory, water is an ampholyte

(B) all acids according to the Brensted-Lowry theory contain a hydrogen atom

(C) according to Bronsted-Lowry theory, ampholytes can both accept and donate protons

(D) according to the Bronsted-Lowry theory, bases contain hydroxide groups

91. The speed of a homogeneous-catalytic process depends on:

(A) the concentration of the starting substances

(B) the catalyst concentration

(C) the concentration of the starting substances and of the catalyst

(D) depends on the energy of the initial and final states of the process

100. Which of the following statements is not true?

(A) enzymes are biocatalysts

(B) catalysts can be in a different aggregate state

(C) catalysts speed up or slow down chemical reactions

(D) catalysts speed up chemical reactions only at high temperature

86. In the equilibrium system: $N_{2(g)} + 3H_{2(g)}⇆ 2NH_{3(g)}$ at constant temperature:

(A) $c(N_2).c(H_2) = c(NH_3)$

(B) $c(N_2).c^3(H2) = c^2(NH_3)$

(C) $c(N_2) = c(H_2) = c(NH_3)$

(D) $c(N_2)$, c(H2) and $c(NH_3)$ are permanent

96. The reaction products of an endothermic process:

(A) are more stable than the starting substances

(B) have the same stability as the starting substances

(C) are more unstable than the starting substances

(D) there is no correct answer

85. In the reaction: $A+ B+ Q ⇆ C+D$ the formation of the products is accompanied by:

(A) lowering the temperature in the system

(B) increase in temperature in the system

(C) maintaining the same temperature

(D) there is no correct answer

115. Consider the reaction: $2 NO_{(g)} + Cl_{2(g)}⇄ 2 NOCI_{(g)};$ ΔH > 0, Which of the following conditions maximize the amount of $Cl_{2(g)}$ present at equilibrium?

(A) low temperature, high pressure

(B) high temperature, low pressure

(C) low temperature, low pressure

(D) high temperature, pressure has no effect

110. Iron (III) oxide is completely dissolved in the required amount of diluted sulfuric acid. A zine granule is placed in the resulting solution. Indicate the type of reaction that does NOT occur in the described experiment:

(A) substitution reaction

(B) reversible reaction

(C) redox reaction

(D) NON-catalytic reaction

62. Two fructose solutions (1) and (2) have concentrations c; and cz such that of c < cz The boiling points ($Tk: and Tk_2$) of these solutions can be said that:

(A) $Tk_1 > Tk_2$

(B) $Tk_1 = Tk_2$

(C) $Tk_1 < Tk_2$

(D) $Tk_1 ≥ Tk_2$

88. In the reaction: $SO_{(2(g)} + 2H_2S_{(g)} →3S{(s)} + 2H_2O_{(1)}$ the oxidizing agent is:

(A) $SO_2$

(B) $H_2S$

(C) S

(D) $H_2O$

116. ?Which statement is NOT correct for the reaction $2NO_{(g)} + O_{2(g)}⇄ 2NO{(g)}$

(A) At equilibrium, the forward and reverse reactions occur at equal rates.

(B) Reaction to the left or to the right occurs spontaneously until the equilibrium state is reached.

(C) Reducing the volume of the system has no effect on the equilibrium amounts of NO, N2 and O2.

(D) The value of equilibrium constant is the same at all temperatures.

90. The process of dissolving concentrated $H_2SO_4$ in water is:

(A) endothermic - heat is absorbed

(B) exothermic - heat is released

(C) exothermic - heat is absorbed

(D) endothermic - heat is released

79. In what container can an aqueous solution of nickel sulfate be stored?

(A) iron

(B) copper

(C) aluminum

(D) zinc

74. The simple substances of which of the listed chemical elements: A - copper; B - iron; C - silver; D - aluminum; E - chrome, can react with concentrated sulfuric and nitric acid when heated?

(A) A, C and D

(B) A and C

(C) C, D and E

(D) all of them

87. At a given temperature, a saturated solution can become unsaturated when:

(A) its volume is reduced

(B) solvent is added

(C) solvent is evaporated

(D) solute is added

118. For a reversible exothermic reaction

(A) Keg and kr both increase

(B) Keg and kg both decrease

(C) Keq decreases and kr increases

(D) Keg increases and kr decreases

78. The acidic salts are obtained after:

(A) incomplete neutralization of polybasic acids

(B) incomplete neutralization of multivalent bases

(C) interaction of equivalent amounts of acids and bases

(D) hydrolysis of salts

105. Which of the described processes does NOT release hydrogen?

(A) methane is heated in an anaerobic environment to 1000 °C

(B) an electric current is passed through an aqueous solution of potassium chloride

(C) an iron nail is placed in dilute hydrochloric acid

(D) aluminum foil is placed in a container with concentrated nitric acid

95. Which of the following statements is not true about catalysts:

(A) they change the heat effect of the reaction

(B) they can form intermediate compounds with the starting substances

(C) they change the activation energy of the chemical reaction

(D) they do not affect chemical equilibrium

109. In which of the equilibrium systems does the equilibrium shift in the same direction as temperature decreases and pressure increases?

(A) $C_3H_{8(g)}⇄ C_3H_{(4(g)} + 2H_{2(g)} - Q$

(B) $H_{2(g)} + Cl_{2(g)}⇄2HCl_{(g)} +Q$

(C) $H_{2(g)} + I_{2(s)}⇄2HI{(g)}+Q.$

(D) $N_{2(g)} + O_{2(g)}⇄2NO_{(g)}- Q$

7. The element X has an atomic number of 8 and a mass number of 17. The atoms of this element contain :

(A) 9 protons

(B} 9 electrons

(C) 9 neutrons

(D) 9 protons and 9 electrons

5. The capability of alcohols to form intermolecular hydrogen bonds to:

(A) decrease boiling point

(B) poor solubility in water

(C) decreased vapor pressure

(D) increased solubility in non polar solvents

82. The hydrolysis constant $(K_h)$ depends on:

(A) dilution

(B) the temperature

(C) the pressure

(D) the concentration of the solute

106. Which of the reactions shown is substitutional?

(A) $NHaBr(D)→ NH_3 + HBr$

(B) $CaO + CO_2 → CaCO_3$

(C) $Fe + 2HI → Fel_2 + H_2$

(D) $RbOH + HCl → RbCl+ H_2O$

2. Which is the correct order for the listed atoms with increase of the atomic radius?

(A) $Li$, $Be$, $Na$

(B) $Li$, $Na$, $B$, $Be$

(C) $Na$, $Li$, $Be$, $B$

(D) $B$, $Be$, $Li$, $Na$

117. Which of the following statements about H2SOs, a diprotic acid, is true?

(A) There is just one lone pair on the sulfur atom.

(B) It is a strong acid.

(C) The hydrogen atoms are bonded directly to the sulfur atom.

(D) The oxidation state of sulfur is +6.

103. The reaction $A_{(g)} + 2 B_{(g)} →3 B_{(g)}$ was found to have a kinetic equation of the form $v = kcAcB$. How will the rate of the reaction change if the volume of the reaction mixture is halved?

(A) it will rise 8 times

(B) it will decrease 8 times

(C) it will rise 4 times

(D) it will decrease 4 times

3. A π-bond is the result of:

(A) overlap of two s-orbitals

(B) overlap of an s- and a p-orbital

(C) overlap of two p-orbitals

(D) overlap of an s- and a d-orbital

101. The following reaction is given: $N_{2(g)} + 3H_{2(g)} ⇄2NH_{3(g)} + Q$. Indicate which of the listed effects will not lead to an increase in the equilibrium concentration of the product of the reaction:

(A) increase in pressure

(B) increase in temperature

(C) increase of the concentration of $H_2$

(D) increasing of the concentration of $N_2$

58. The maximum number of electrons in the third electron shell of atoms is:

(A) 2

(B) 8

(C) 18

(D) 3

112. Which of the listed substances has a molecular crystal lattice in a solid aggregate state?

(A) silicon (IV) oxide

(B) silicon

(C) sodium oxide

(D) white phosphorus

73. A natural polymer is:

(A) sucrose

(B) the rubber

(C) viscose

(D) polyethylene

98. The acylation of benzene with propanoyl chloride, according to the Friedel-Crafts reaction, takes place in the presence of a catalyst:

(A) palladium acetate

(B) aluminum trichloride

(C) mercury sulfate

(D) manganese dioxide

68. Oxidation of which alcohol does not produce a carbonyl compound?

(A) 2, 3-dimethy]-2-butanol

(B) 2, 3-dimethyl-1-butanol

(C) 2-methy]-1-butanol

(D) 3-methyl-2-butanol

74. Which of the organic compounds shown has a chemical bond formed by overlapping sp? and sp hybrid orbitals?

(A) $CH_2=CH-CH=CH_2$

(B) $CH_2=CH=CH_2$

(C) $CH_2=CH-CH_3$

(D) $CH_2=CH_2$

49. Carbonyl derivatives DO NOT add one of the following substances:

(A) hydrogen

(B) hydrogen cyanide

(C) bromine

(D) ethanol

85. In which hydrocarbon conversion process do the final products contain a greater number of carbon atoms than the starting substances?

(A) aromatization

(B) hydration

(C) cracking process

(D) Wurtz synthesis

10. The reactivity of alkyl halides decreases in the following order:

(A) RI>RBr >RCl>RF

(B) RF >RCI> RBr >RI

(C) RBr> RCI> RI> RF

(D) RCl >RBr> RI >RF

46. Which of the following alcohols forms a ketone when oxidized?

(A) 1-propanol

(B) 2-methyl-2-propanol

(C) 2-propanol

(D) all of the above

90. Positional isomerism is possible with:

(A) alkenes, alcohols, aldehydes

(B) alcohols, carboxylic acids, alkanes

(C) aldehydes, ketones. amines

(D) amino acids, ketones, alkynes

82. Which of the following compounds does NOT react with an ammonia solution of $Ag_2O$?

(A) glucose

(B) fructose

(C) 3-hexanone

(D) 3-methylbutanal

95. Cellulose dissolves in:

(A) ammonia solution of $A_{g2}O$

(B) Fehling's solution

(C) Schweitzer's reagent

(D) does not dissolve in any of the listed reagents

53. The colorless crystalline substance A is slightly soluble in water, it sublimes when heated, and 2 mol of $NaOH$ are needed for the neutralization of 1 mol of A. Substance A is:

(A) ethanol

(B) phenol

(C) salicylic acid

(D) sulfuric acid

96. What are the reactants that form the compound $CH_3CH_2COOCH_2CH_3$?

(A) propan-1-ol and propanal

(B) propan-1-ol and ethanoic acid

(C) ethanol and propanoic acid

(D) ethanol and butanoic acid

64. In which order are carboxylic acids arranged by increasing their acidic properties?

(A) benzoic, propionic, acetic, formic

(B) propionic, acetic, benzoic, formic

(C) acetic, propionic, formic, benzoic

(D) benzoic, acetic, propionic, formic

45. What is the IUPAC name for the compound $CH_3CH_2CH_2CH_2CHO$?

(A) pentanal

(B) pentanoic acid

(C) 1-pentanol

(D) 1-pentanone

91. Which of the following substances does NOT react with freshly precipitated copper dihydroxide:

(A) fructose

(B) propanone

(C) methanoic acid

(D) ethanal

11. Which of the listed compounds is a homologue of ethanal?

(A) methanal

(B) acetone

(C) propanone

(D) acetaldehyde

71. In the interaction between substances A and B, $ZnCl_2$ and $CH_3CH=CHCH_3$ are obtained. Substances A and B are:

(A) $Zn$ and $CH_3CH(CI)CH(CI)CH_3$

(B) $Zn$ and $(CH_3)_2CH-CH(Cl)_2$

(C) $Zn$ and $CICH_2CH_2CH_2CH_2Cl$

(D) $Zn$ and $(Cl_2CHCH_2CH_2CH_3$

48. The the benzene ring of benzaldehyde substitutes at m-position to the aldehyde group

because it has:

(A) +M and +] effect

(B) -M and +] effect

(C) -M and -I effect

(D) +M and -I effect

97. From which compound is hexan-3-one obtained as the only organic product under the conditions of the Kucherov reaction?

(A) $CH_3C=CCH_2CH_2CHs3$

(B) $CH_3CH_2C=CCH_2CH_2$

(C) $CH_3CH=CHCH_2CH_2CH_3$

(D) $CH3CH2CH=CHCH2CH3$

38. By which of the presented processes and interactions can be distinguished formic acid from ethanoic acid?

(A) cuprum dihydroxide

(B) active metal

(C) alkali oxide:

(D) alkali hydroxide

87. Benzaldehyde is involved in substitution reactions affecting the aromatic nucleus. In which place are the substitutes oriented:

(A) o-position

(B) p-position

(C) m-position

(D) o- and p-position

111. The products of cracking are...

(A) alkane + alkene

(B) alkene + alkene

(C) alkane + alcohol

(D) alkane + alkane

102. If an alkane contains 24 hydrogen atoms, how many carbon atoms does it have?

(A) 12

(B) 11

(C) 24

(D) 22

106. Which of the following compounds displays optical isomerism?

(A) $CH_2(OH)-CH_2(OH)$

(B) $CH_3-CHCI-COOH$

(C) $CH_2=CHC_l$

(D) $CHCI=CHCl$

86. Polymethyl methacrylate is obtained by polymerization of:

(A) $CeHsCH=CRH2;$

(B) $CH2=CHCOOCHS;$

(C) $CH_2=C(CH_3)COOCH_3$

(D) $CH_3CH_2CN$

32. Asa result in the reaction of polycondenzation is formed:

(A) polyvinylchloride

(B) phenol formaldehyde resin

(C) natural rubber

(D) polyethylene

94. The molecular formula $C_6H_{12}O_6$ corresponds to the compounds:

(A) cellulose and glucose

(B) starch and glucose

(C) glucose and fructose

(D) glycogen and sucrose

5. Salicylic acid is stronger than benzoic acid because:

(A) has an aromatic structure

(B) an intramolecular hydrogen bond is formed between the two functional groups

(C) contains a hydroxy! group

(D) forms stronger hydrogen bonds with water molecules than the benzoic acid

65. The vigorous oxidation of which isomer of hexene does NOT result in a mixture of acids?

(A) 1-Hexene

(B) 2-hexene

(C) 3-hexene

(D) 4-methyl-1-pentene

79. The equation: $C_2H_2 + HCOOH?HCOOC_2H_5 +H_2O$ expresses the process:

(A) hydrolysis

(B) oxidation

(C) neutralization

(D) esterification

56. Adding bromine to propene $H_2C=CH-CH_3$ gives:

(A) 1, 2-dibromopropane

(B) 1, 2-dibromopropene

(C) 2, 3-dibromopropane

(D) 1, 1-dibromopropene

33. Ethyl alcohol is formed by addition of hydrogen to:

(A) ethane

(B) ethanal

(C) ethyne

(D) methanal

2. How many isomers exist for dibromobenzene $(C_6H_4Br_2)$?

(A) one

(B) two

(C) three

(D) four

37. Which of the following amino acids is achiral?

(A) alanine

(B) glycine

(C) serine

(D) cysteine

76. State the general molecular form of the homologous series of alkanes:

(A) $C_nH_{2n+2}$

(B) $C_nH_{2n-2}$

(C) $C_nH_{2n}$

(D) $C_nH_{2n+4}.$

59. The main components of the petrol are:

(A) alkanes

(B) alkenes

(C) alkynes

(D) arenas

89. Which of the following acids has optical isomers:

(A) lactic acid

(B) butanoic acid

(C) p-aminobenzoic acid

(D) phenylacetic

42. When methane, $CH_4$, burns in excess oxygen, the products would be

(A) $CO_2 + 2H$;

(B) $CO + H_2O$;

(C) $CH_3OH$;

(D) $CO_2+ B_2O$.

13. The hydrolysis of 4-chlorobenzyl chloride with a concentrated solution of sodium hydroxide results in:

(A) p-chlorophenol

(B) p-hydroxybenzylchloride

(C) p-chlorobenzy! alcohol

(D) p-hydroxybenzyl alcohol

77. Oxidation of ethylene $(CH_2=CH_2$) produces:

(A) methane

(B) 1, 2-ethanediol

(C) ethane

(D) propane

34. Upon interaction of phenol with bromine is formed a mixture of:

(A) 2- and 3- bromophenols

(B) 3- and 4- bromophenols

(C) 2- and 4- bromophenols

(D) 2, 3- and 3, 4- dibromophenols

36. Ethanol can be oxidized stepwise. What is the first stable intermediate product when ethanol is oxidized with a mild oxidation agent?

(A) $CH_3COOH$

(B) $CO_2$

(C) $CH_3CHO$

(D) $CH_3CH_2OH$

43. A carbonyl group is present in all of these functional groups except:

(A) ketones;

(B) esters;

(C) ethers;

(D) amides.

83. The two functional groups in o-amino acids interact with each other and form intramolecular salts. It is due to them...

(A) the high solubility in water

(B) the high melting point

(C) the low solubility in organic solvents

(D) all of the above properties

30. Characteristic reactions for alkenes are:

(A) substitution

(B) addition

(C) elimination

(D) exchange

18. How a solution containing benzene, naphthalene, phenol and aniline can be separated:

(A) the phenol and aniline are separated with sodium hydroxide solution, and benzene and naphthalene - with hydrochloric acid;

(B) the phenol and aniline are separated with nitric acid, and benzene and naphthalene-with sulphuric acid;

(C) the phenol is extracted after treatment with sodium hydroxide, the aniline is extracted after treatment with hydrochloric acid, and benzene and naphthalene - through distillation;

(D) the phenol and aniline are separated through distillation, and benzene and naphthalene-by nitration with nitrating mixture;

44. Which of the following is not classified as a carbohydrate?

(A) glucose

(B) glycine

(C) lactose

(D) starch

75. Hydrogen bonds can NOT form between molecules of:

(A) $CO_2H_5NH_2$ and $CH_3NH_2$

(B) $CH_3CHO$ and $CH_3COCH_3$

(C) $CH_3CHO$ and $H_2O$

(D) $C_2H_5OCH_3$ and $H_2O$

78. A phenolic hydroxyl group can be identified with a dilute aqueous solution of:

(A) $Cu(OH)_2$

(B) $KM_nO_4$

(C) $FeCh_3$

(D) $KNO_3$

52. The interaction between which substances is an addition reaction?

(A) ethanol and sodium

(B) ethanal and hydrogen

(C) methane and chlorine

(D) phenol and sodium hydroxide

104. When organic compounds combust in a plentiful supply of air, what are the products?

(A) Carbon dioxide only

(B) Carbon monoxide and water

(C) Carbon dioxide and hydrogen

(D) Carbon dioxide and water

9. Which of the following reagent CANNOT be used for preparing alkyl chlorides from alcohols?

(A) $HCl$ + anhyd. $ZnCl_2$

(B) $NaCl$

(C) $PCl_5$

(D) $SOCl_2$

80. In the molecules of a-amino acids the groups $-NH_2$ and $-COOH$ are connected to:

(A) the first carbon atom

(B) the second carbon atom

(C) different carbon atoms

(D) carbon atoms at both ends of the carbon chain

103. Ethanol has a lower boiling point than water because...

(A) the -OH groups in the ethanol molecules have a tendency to cling together

(B) the attraction between the molecules is weaker

(C) the ethanol molecules can easily lose a hydrogen atom

(D) the ethanol molecules mix well with water

81. Which of the following carbohydrates contains molecules with an aldehyde group?

(A) fructose

(B) glucose

(C) sucrose

(D) starch

50. Under hydrolitic conditions sucrose yields:

(A) glucose only

(B) glucose and fructose

(C) fructose only

(D) glucose and lactose

31. Polypropylene is obtained from a substance with formula:

(A) $CH_2=CH_3$

(B) $CH_3-CH_2-CH_3$

(C) $CH_2=CH-CH_3$

(D) $CH_2=C=CH_2$

69. The structural isomers of hexene differ in the position of the double bond. What is their number?

(A) two

(B) three

(C) four

(D) five

3. What is the correct name for $CCl_4$?

(A) tetrachloromethane

(B) carbon chloride

(C) carbon(IV) chloride

(D) carbon chlorate

70. Under what conditions can hydrogen atoms in the side chain of toluene be replaced by atoms of halogen elements:

(A) at room temperature

(B) under illumination or at high temperature

(C) upon cooling

(D) with the participation of a catalyst

19. Which halogen notably does NOT react with methane by the chain-linking mechanism?

(A) bromine

(B) iodine

(C) chlorine

(D) all halogens interact easy with methane

25. How many carbon atoms in the molecule of acrylonitrile are in sp-hybrid state?

(A) one

(B) two

(C) all

(D) none

101. The compounds (E)-3-methylhex-3-ene and (Z)-hept-2-ene are:

(A) positional isomers

(B) optical isomers

(C) enantiomers

(D) constitutional (structural) isomers

58. The interaction of fats with an alkaline base in an aqueous medium during heating is used in the production of:

(A) synthetic fibers

(B) soaps

(C) rubber

(D) plastics

117. Linolenic acid as opposed to stearic acid:

(A) is a higher saturated carboxylic acid

(B) is an isomer of oleic acid

(C) upon interaction with glycerin forms triglycerides

(D) decolorizes bromine water

22. Which of the following compounds is product of interaction between glucose and Fehling reagent:

(A) $CH_2OH(CHOH)_4CHO$

(B) $HOOC(CHOH)_4COOH$

(C) $HOOC(CHOH)_4CHO$

(D) $CH_2OH(CHOH)_4COOH$

14. The polyvalent alcohols are identified with:

(A) freshly precipitated copper (I) hydroxide

(B) ferry chloride solution

(C) bromine water

(D) solution of silver oxide in ammonia

4. Which of the following reagent can be used to distinguish phenol from benzyl alcohol?

(A) $NaOH$

(B) $NaHCO_3$

(C) $Br2/CCl_4$

(D) $FeCl_3$

6. Phenols are more acidic than alcohols because:

(A) the phenoxide ion is stabilized by resonance

(B) the phenols are more soluble in polar solvents

(C) the phenoxide ion do not exhibit resonance

(D) the alcohols do not lose proton

12. Which of these compounds contain an asymmetric (chiral) carbon atom?

(A) 1-chloropropane

(B) 2-methyl-2-chlorobutane

(C) 3-chloropropane

(D) 2-bromobutane

1. Which compound decolorizes bromine in $CHCl_3$?

(A) benzene

(B) cyclohexane

(C) hexane

(D) 1-hexene

116. Sucrose dissolved in water is:

(A) caramelization

(B) hydrolysis of sucrose with formation of glucose

(C) hydrolysis of sucrose with formation of fructose

(D) disruption of the sucrose crystal lattice

47. Which is NOT a physical property of alcohols or phenols?

(A) Phenols are generally only slightly soluble in water.

(B) The solubilities of normal primary alcohols in water decrease with increasing molecular weight.

(C) The hydroxyl group of an alcohol is nonpolar.

(D) Due to hydrogen bonding, boiling points of alcohols are much higher than those of corresponding alkanes.

105. Give the IUPAC name of this compound: $CH_3OCH_2CH$.

(A) dimethyl ether

(B) methoxyethane

(C) methylethyloxide

(D) propy! ether

41. Glucose and fructose may be distinguished by interaction with:

(A) sodium

(B) $C_u(OH)_2$

(C) bromine water

(D) water

29. Which of the listed compounds interacts with bromine water?

(A) ethyn

(B) benzene

(C) toluene

(D) propane

88. Reagent for the quality identification of starch is:

(A) bromine water

(B) alcoholic solution of iodine

(C) ammonia solution of silver oxide

(D) dilute aqueous solution of potassium permanganate

24. Polymerization is characteristic for:

(A) ethene

(B) methylbenzene

(C) methane

(D) heptene

21. The amino acids do NOT interact with:

(A) alcohols

(B) alkaline hydroxides

(C) active metals

(D) salts

114. Which of the following is a correct name for $(CH_3)_2C=CHCOCH_3$?

(A) 2-methyl-2-penten-4-one

(B) 4-methyl-3-penten-2-one

(C) 1, 3-dimethyl-2-pentenal

(D) isopentenone

35. By the help of which reagent 1-propanol and 1, 3-propantriol may be, distinguished?

(A) potassium hydroxide

(B) metal sodium

(C) copper (II) hydroxide

(D) bromine water

93. Optical isomerism is not characteristic of:

(A) 2-aminopropanoic acid

(B) 3-aminobutanoic acid

(C) 2-aminobutanoic acid

(D) 2-amino-2-methylpropanoic acid

28. Which of the listed substances when interacting with methylamine gives a salt?

(A) bromomethane

(B) oxygen

(C) hydrogen bromide

(D) water

23. Which of the following compounds contains an aldehyde group:

(A) glucose

(B) methanoic acid

(C) methanal

(D) all listed compounds

61. What is substance X in the transition $CH=CH_2→ X → CH_3CH_2ON_a$:

(A) $H2S04$

(B) $CH3CHO$

(C) $CH3CH20H$

(D) $CHsCOOH$

62. Oxidation of butanone produces:

(A) only formic acid

(B) formic and propionic acid

(C) propionic acid, $CO_2$ and $H_2O$

(D) acetic and propionic acids, $CO_2$ and $H_2O$

39. With which of the compounds: ethanol, sodium hydroxide and acetic anhydride, salicylic acid is interacting?

(A) only sodium hydroxide and ethanol

(B) only ethanol and acetic anhydride

(C) only sodium hydroxide

(D) sodium hydroxide, ethanol and acetic anhydride

26. The maltose is:

(A) a disaccharide consisting of glucose and fructose residues, an intermediate in the hydrolysis of cellulose;

(B) a disaccharide consisting of glucose residues, an intermediate in the hydrolysis of starch

(C) a disaccharide consisting of fructose residues, an intermediate in the hydrolysis of amylose;

(D) a disaccharide consisting only of glucose residues.

63. Which of the following equations shows the alcoholic fermentation of glucose under the action of the enzyme chymase?

(A) $6CO_2+ 6H_2O→C_6H_{12}O_6 + 6O_2$

(B) $C_6H_{12}O_6→2C_2H_5OH + 2CO_2$

(C) $C_6H_{12}O_6 + 6O_2→ 6CO_2+ 6H_2O$

(D) $C_6H_{12}O_6→2C_2H_5OH + 2CO$

7. The strongest acid among the following aromatic compounds is:

(A) ortho-nitrophenol

(B) para-chlorophenol

(C) para-nitrophenol

(D) meta-nitrophenol

107. Which of the following statements is FALSE regarding the reaction between $Cl_2$ and $C_2H_6$?

(A) The reaction can be initiated with either sunlight or heat.

(B) The reaction will give a single product of $C_2H_5Cl$.

(C) The reaction mechanism involves free radicals.

(D) The first step in the mechanism is the cleavage of the $Cl-Cl$ bond to give chlorine atoms.

54. Which of the reagents can be used to identify glycerol?

(A) with bromine water - discoloration

(B) with alcohol solution of $I_2$- violet coloration

(C) with an aqueous solution of $F_eCl_3$ - violet coloring

(D) with freshly precipitated $C_u(OH)_2$ - dark blue coloration

67. Compound A is involved in a addition reaction with HCN. After addition of hydrogen to A, 2-butanol is obtained. Which of the following compounds is A?

(A) $CH_3CH_2COCH_3$

(B) $CH_3CH(CH_3)CHO$

(C) $CH_2=CHCH_3$

(D) $CH_3CH_2CH_2CHO$

115. As a result of the interaction of acetylene with water in the presence of salts of divalent mercury ions, the following is formed:

(A) $CH_3CHO$

(B) $C2Hs0H$

(C) $C_2H_4$

(D) $CH_3COOH$

66. In which order are the compounds arranged in order of increasing reactivity?

(A) $CH_3CHO$, $CH_3COC_2H_5$, $CH_3CHO$, $CH_5COCH_3$

(B) $CH_3CHO$, $CH_3COCH_3$, $HCHO$, $CHsCOC2Hs$

(C) $CH3COCH$, $CH3COC2Hs$, $CH_3CHO$, $HCHO$

(D) $CH_3COC_2H_5$, $CH_3COCH_3$, $CH_3CHO$, $HCHO$

109. Hydrolysis (saponification) of a fat would yield:

(A) water and an alkene

(B) ethanol and propanoic acid

(C) glycerol and soa

(D) ethanol and a soap

16. The mild oxidation of which alcohol does NOT give a carbonyl compound?

(A) 2, 3-dimethyl-l-pentanol

(B) 3-methyl-2-pentanol, 3-dimethy]-3-pentanol

(C) 2, 3-dimethy-3-pentanol

(D) 3-methyl-1-pentanol

60. The main component of the so-called “marsh gas” or "swamp gas" is:

(A) methane

(B) carbon monoxide

(C) sulfur dioxide

(D) nitrogen

84. From which substance can 2-propanol be obtained directly?

A) $CH3—CH2—CH3$

(B) $CH_3—CH_2—CH2—Br$

(C) $CH_3—-CH=CH_2$

(D) $CH_3—C=CH$

92. Which chain of chemical reactions is not possible:

(A) $CH_3COOH→CH_3COONH_4→CH_3CONH_2$

(B) $C_6H_5CH_3 →CH_3COOH→ C_6H_5COOCH_3$

(C) $C_2H_5OH→C_2OH_5CHO →C_2H_5COOH$

(D) all are possible

100. The chain-radical halogenation of alkanes occurs under the action of:

(A) $FeCl_3$

(B) $HgSO_4$

(C) diffuse sunlight

(D) nickel catalyst

51. The molecular formula of glycerol is:

(A) $C_6H_5OH$

(B) $C_2H_5OH$

(C) $C_3H_5(OH)_3$

(D) $CH_3CHO$

112. What is the major organic product of the reaction: $CH_3C=CH + 2HBr→$?

(A) $BrCH_2CH_2CH_2Br$

(B) $CH_3CBr_2CH_2$

$CH_3CH_2CHBr_2$

$CH_3CHBrCH_2Br$

20. Hexane may be obtained in highest yield by Wurtz method from:

(A) chloromethane

(B) 1-chloropropane;

(C) 2-methyl-1-bromopropane

(D) 2-bromopropane.

57. The unknown substance X in the following transition is: $H_2C=CH2→X→CH_3CHO→CH_3COOH$?

(A) $CH_3CH_3$

(B) $CH_3CH_2OH$

(C) $CH_3OCH_3$

(D) $CH_3COCH_3$

118. How is the compound $HOCH_2(CHOH)_4CH_2OH$ obtained?

(A) by oxidation from glucose

(B) by oxidation from fructose

(C) by reduction with hydrogen from glucose and fructose

(D) by alcoholic fermentation from glucose and fructose

113. Which of the following reacts with $[A_g(NH_3)_2]OH$ giving a white precipitate?

(A) $CH_3CH_2CH=CHCH_3$

(B) $CH_3CH_2C≡CCH_3$

(C) $CH_3CH_2C≡CH$

(D) $CH_3CH_2CH_2CH_2OH$

99. Reagent for qualitative identification of ethylene glycol is:

(A) solution of $KOH$ in ethanol

(B) aqueous solution of chlorine lime

(C) freshly precipitated $Cu(OH)_2$

(D) aqueous solution of $FeCl_3$

27. The following reaction scheme is given: 1, 2-dibromoethane →X→ bromoethane→Y→ ethyl acetate. Determine from the lists compounds X and Y.

(A) ethanol and ethanal

(B) ethanal and ethene

(C) ethene and ethanol

(D) ethyn and ethanal

15. Thereactions by which m-nitrophenol can be produced from benzene are:

(A) sulfonation, nitration, reaction with sodium hydroxide, alkali melting

(B) sulfonation, alkali melting, nitration

(C) nitration, sulfonation, hydrolysis

(D) halogenation, hydrolysis, nitration

55. Sucrose is a carbohydrate. The molecular formula of the compound is:

(A) $C_{12}H_{22}O_{11}$

(B) $C_{12}H_{24}O{12}$

(C) $C_6H_{12}O_6$

(D) $C_2H_6O$

40. Which one of the following will give 1-butene as the only alkene by heating with concentrated sulfuric acid?

(A) 1-butanol

(B) 1-Bromobutane;

(C) 1-Butanamine

(D) 2-butanol.

108. Ethanol can be oxidized stepwise. What is the first stable intermediate product when ethanol is oxidized with a mild oxidation agent?

(A) $CH_3COOH$

(B) $CO_2$

(C) $CH_3CHO$

(D) $CH_3OCH_3$

17. Which of the presented pairs are metamers?

(A) $CH_3CH(OH)CH_2CH_3$ and $CH_3CH_2OCH_2CH_3$

(B) $CH_3CH(OH)CH_3$ and $CH_3CH_2CH_2OH$

(C) $CH_3CH_2OCH_33$ and $CH_3CH_2CH_20CH3$

(D) $CH_3OCH_2CH_2CH_3$ and $CH_3CH_2OCH_2CH_3$

72. When freshly precipitated $Cu(OH)_2$; was added at room temperature to several test tubes with aqueous solutions of unknown substances, a dark blue solution was observed in one of them. Therefore, in this tube there is an organic compound in the molecule of which there is:

(A) one ketone group

(B) one hydroxy] group

(C) two or more aldehyde groups

(D) two or more hydroxyl groups

8. What is the common name for $CH_2=CHCH_2C1$:

(A) propylidene chloride

(B) vinyl chloride

(C) allyl chloride

(D) vinyllene chloride

110. The segment $-CH_2CH_2CH_2CH_2CH_2CH_2-$ represents the polymer named:

(A) polybutylene

(B) polyhexene

(C) polypropylene

(D) polyethylene