Inorganic Chemistry – MU Sofia Exam preparation

Welcome to your Chemistry Inorganic

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

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

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

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

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

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

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

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

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

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

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

8. Which of the following elements exists as monoatomic gas under standard conditions?

(A) nitrogen

B) bromine

(C) ozone

(D) neon

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;

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;

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;

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;

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;

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;

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;

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

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

19. Oxidative-reductive processes could be:

(A) intermolecular

(B) intramolecular

(C) disproportionation

(D) all answers are correct

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

(A) +1

(B) +2

(C) 0

(D) -1

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

22.The hydroxonium ion is represented as :

(A) $H_2O{^+}$

(B) $H_3O{^+}$

(C) $HOH{^+}$

(D) $H{^-}$

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) $Fe$

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

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.

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

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.

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

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

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,

31. The isotopes :

(A) occupy one and the same location in the periodic table of elements,

(B)occupy adjacent locations in the periodic table of elements,

(C) are other atoms,

(D) have different atomic numbers.

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.

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.

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,

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

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

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.

38. The Tyndall effect is due to :

(A) dispersion of the light

(B) the electrical charge of the granules

(C) the Brown motion of the particles

(D) the destruction of the colloidal solution.

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.

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.

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) $NaCl$ .

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.

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.

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

(A) 0.01,

(B) 1,

(C) 2,

(D) 10.

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

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

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 $NO_2$

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

(A) $NO$

(B) free $N2$

(C) $NO_2$

(D) ammonia cannot be oxidized

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 $-1/2$

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.

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 -$Br_2$

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

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) $CO, N_{a2}CO_3$

54. Which of the following substances is an electrolyte?

(A) $C_2H_6$

(B) $C_6H_12O_6$

(C) $C_2H_5OH$

(D) $CH_3COOH$

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

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

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 $N_aCl$

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

(A) 2

(B) 8

(C) 18

(D) 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 $H_2SO_4$

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

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 $H_2O$

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) $Tk_1 ≥ Tk_2$

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) $CI^- ions$

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

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

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

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.

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

(A) $CaH_2$

(B) $CaCO_3$

(C) $CO_2$

(D) $Ca(OH)_2$

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

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) $Ba→ BaO →Ba(OH)_2 → BaSO_4$

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

73. Nitrogen is NOT characterized by interaction with:

(A) metals

(B) oxygen

(C) water

(D) hydrogen

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

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

(A) 4f

(B) 4d

(C) 5f

(D) 5g

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

(A) $NO$

(B) $NO_2$

(C) $N_2O_4$

(D) $N_2O_5$

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

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

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

(A) iron

(B) copper

(C) aluminum

(D) zinc

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

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

(A) yellow

(B) green

(C) violet

(D) red

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

(A) dilution

(B) the temperature

(C) the pressure

(D) the concentration of the solute

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

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) $CuSO_4, NH_4NO_3$

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

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

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

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) $H_2O$

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

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

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

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

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

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) $C_uO + H_2O →$

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

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

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

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

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

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

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 $N_2$

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 $I^-$

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

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) $2NO_2 + H_2O → HNO_3 + HNO_2$

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

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) $RbOH + HCl → RbCl+ H_2O$

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

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

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) $N_{2(g)} + O_{2(g)}⇄2NO_{(g)}- Q$

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

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

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

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

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) $C_2Cl_6, Cu, HI$

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

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.

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.

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