TG EAMCET (EAPCET) Chemistry Multiple Choice Questions (MCQs)

71. Which of the following is true for a galvanic cell?

A) It converts electrical energy into chemical energy

B) It converts chemical energy into electrical energy

C) It requires an external power source

D) It is an electrolytic cell

72. The Nernst equation is used to calculate:

A) Electrode potential at standard conditions

B) The equilibrium constant for a reaction

C) The Gibbs free energy of a reaction

D) The ionization constant of a weak acid

73. In an electrochemical cell, the cell potential is related to:

A) Temperature and pressure only

B) Concentration of reactants and products

C) Only the electrode material

D) Only the nature of the electrolyte

74. What does the conductivity of an electrolyte solution depend on?

A) The nature of the electrolyte and its concentration

B) The volume of the solution

C) The temperature alone

D) The surface area of the electrolyte

75. The primary difference between strong and weak electrolytes is that:

A) Strong electrolytes dissociate completely in solution, while weak electrolytes dissociate partially

B) Weak electrolytes dissociate completely, while strong electrolytes dissociate partially

C) Strong electrolytes have high boiling points, while weak electrolytes have low boiling points

D) Weak electrolytes conduct electricity, while strong electrolytes do not

76. Faraday's first law of electrolysis states that:

A) The mass of the product at the electrode is directly proportional to the current passed through the electrolyte

B) The mass of the product at the electrode is inversely proportional to the current passed

C) The voltage required for electrolysis is inversely proportional to the current passed

D) The mass of the product is unaffected by the current passed

77. The half-life of a first-order reaction depends on:

A) The initial concentration of the reactant

B) The rate constant

C) The volume of the reaction mixture

D) Both the rate constant and the temperature

78. What is the unit of the rate constant (k) for a zero-order reaction?

A) mol/L·s

B) 1/s

C) mol/L·s²

D) mol/L

79. In a pseudo-first-order reaction, the concentration of one reactant is:

A) Constant

B) Proportional to time

C) Much greater than the other reactant

D) Zero

80. The collision theory of chemical reaction rates explains that:

A) The rate of a reaction is directly proportional to the concentration of reactants

B) The reaction rate depends on the number of effective collisions between reacting molecules

C) Temperature does not affect the rate of reaction

D) A catalyst lowers the activation energy but does not affect the rate constant