Chemistry: Exam Fore

61. Given the following oxidation - reduction reaction:
H₂S + HNO₃ → S + NO + H₂O
Which of the following is CORRECT from the given equation?

A. HNO₃ is an oxidizing agent. B. S is a reducing substance. C. The oxidation number of S is decreased. D. The oxidation number of N is increased.

62. Consider the following diagram of an electrolytic cell:

Which of the following is CORRECT from the given diagram?

A. There is decrease in oxidation number of chloride ion. B. Magnesium ion is oxidizing agent in the electrode reaction. C. Reduction takes place at the anode. D. Oxidation takes place at the cathode.

63. Which of the following is CORRECT about molten electrolytes and aqueous electrolytes?

A. During the electrolysis of a molten electrolyte, the reduction of cations occurs at the cathode. B. An electrolyte that conducts electricity when dissolved in a certain liquid is molten electrolyte. C. Both molten and aqueous electrolytes involve preferential discharge of ions at each electrode. D. The possible half reactions in molten electrolytes are more compared to aqueous electrolytes.

64. Which of the following is NOT the industrial application of electrochemistry?

A. Electro synthesis B. Electromagnetism C. Electroplating D. Electrolytic refining

65. Which of the following chemical industries is INCORRECTLY matched with its products?

A. Paper industry - cartons B. Food industry - Biscuits C. Beverage industry - alcohols D. Textile industry - glasses

66. Which of the following is peroxide?

A. CaO₂ B. K₂O C. FeO D. ZnO

67. Among the following which one is a ternary acid?

A. H₂S B. H₂SO₄ C. HCl D. HBr

68. A student collected few lemons from his/her backyard, brought it to their class and prepared a lemon juice in a beaker. They got blue and red litmus papers from his/her teacher and placed few drops of the lemon juice both on the red and blue litmus papers. What will be their observation on the litmus papers?

A. The blue litmus paper will turn red and the red litmus paper will maintain its color. B. The red litmus paper will turn to blue and the blue litmus paper will maintain its color. C. The blue litmus paper and the red litmus paper will turn colorless. D. The blue litmus paper as well as the red litmus paper will maintain their color.

69. What is the pOH of pure water at 37°C, where K_w equals 2.50 × 10^-14 and its pH is 6.8? (log 2.5 = 0.4)

A. 7.5 B. 6.8 C. 8.2 D. 8.8

70. The hydrogen ion concentration in a certain solution at 25 °C is 1.0 × 10^-8 M. What is the pOH of this solution?

A. 6 B. 2 C. 10 D. 8

71. A student added 25 mL of AgNO₃ solution to a beaker and weighed the mass of the beaker and its content as m₁. He/she added 50 mL of a saturated solution of NaCl into the second beaker and weighed the mass of the beaker and its content as m₂. Finally, he/she mixed the two solutions and weighed the mass of the resulting solution with the two beakers and recorded as m₃. If he/she found that m₃ = m₁ + m₂, which one of the following laws is investigated by this trial?

A. Law of conservation of mass B. Law of conservation of energy C. Law of multiple proportions D. Law of definite composition

72. A chemical reaction that releases heat energy to the surrounding is known as _____.

A. combination reaction B. decomposition reaction C. endothermic reaction D. exothermic reaction

73. A type of reaction in which two compounds react together to form two or more products by exchanging reactants' ions is known as _____.

A. Single Displacement reaction B. Double Displacement reaction C. Combination reaction D. Decomposition reaction

74. "At a given temperature and pressure, equal volumes of different gases contain equal number of molecules", this is known as _____.

A. Avogadro's law B. Gay Lussac's law C. Boyle's law D. Charle's law

75. Which of the following includes the preconditions required for a chemical reaction to occur?

A. Activation energy, pressure and collision between reactants B. Activation energy, proper orientation and collision between reactants C. Temperature, pressure and proper orientation D. Temperature, activation energy, proper orientation

76. Given the following structure:

O || CH3 — C — O — CH3

What is the IUPAC name for the above structure?

A. Ethyl ethanoate B. Methyl ethanoate C. Ethyl acetate D. Propyl formate

77. During summer, the average value for the temperature measured in a certain chemistry laboratory is 298.15 K. How many decimal places are there in the measured value?

A. 3 B. 5 C. 1 D. [Missing Option]

78. Which of the following is the CORRECT Lewis electron dot symbol of MgO?
(Atomic number: Mg = 12 and O = 8)

A. [Mg⁺² :O: ]^- B. [Mg⁺ :O: ]^-2 C. [Mg⁺² :O: ]^-2 D. [Mg⁺ :O: ]^-

79. A student collected four beakers in his/her laboratory and added some small amounts of the following: naphthalene to the first, graphite to the second, iodine to the third and alcohol to the fourth. If they added equal volume of water to each of the above beakers and shake each beaker, which of the following will be their observation?

A. Water will dissolve iodine rather than graphite. B. There will be dissolution in the first three beakers. C. There will be dissolution of alcohol in the fourth beaker. D. Water will dissolve the whole given chemicals in the four beakers.

80. Which of the following explanations about reversible and irreversible reactions is CORRECT?

A. A reaction that proceeds from reactant to product and from product to reactant is known as an irreversible reaction. B. A reaction that has only a forward reaction or a reverse reaction is known as a reversible chemical reaction. C. Chemical reactions that proceed only towards the formation of a product are known as reversible reactions. D. Chemical reactions that proceed only towards the formation of a product are known as irreversible reactions.

Chemistry Exam Fore

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