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NEET UG CHEMISTRY Multiple Choice Questions (MCQs)

NEET UG - Physical Chemistry MCQs

NEET UG - Physical Chemistry Unit 6: Equilibrium MCQs (76-90)

76. What is dynamic equilibrium?

a) The state where reactions stop

b) The state where the rate of the forward reaction equals the rate of the reverse reaction

c) The state where products are more than reactants

d) The state where reactants are more than products

Answer: b) The state where the rate of the forward reaction equals the rate of the reverse reaction

77. Which of the following is true about the equilibrium constant K_c?

a) It depends on the concentration of reactants

b) It is independent of temperature

c) It depends on the temperature of the system

d) It depends on the pressure of the system

Answer: c) It depends on the temperature of the system

78. According to Le Chatelier’s principle, what happens if the concentration of reactants is increased in a system at equilibrium?

a) The system moves towards the product side

b) The system moves towards the reactant side

c) The system reaches a new equilibrium with unchanged concentrations

d) The system moves towards solid formation

Answer: a) The system moves towards the product side

79. In which type of equilibrium does Henry's law apply?

a) Liquid-gas equilibrium

b) Solid-liquid equilibrium

c) Gas-solid equilibrium

d) Liquid-liquid equilibrium

Answer: a) Liquid-gas equilibrium

80. What is the main characteristic of equilibrium in physical processes like solid-liquid or liquid-gas equilibrium?

a) No change in pressure or volume

b) The concentrations of components remain constant over time

c) The rate of reaction becomes zero

d) The products are formed faster than reactants

Answer: b) The concentrations of components remain constant over time

81. What is the effect of a catalyst on the chemical equilibrium?

a) It increases the concentration of reactants

b) It increases the concentration of products

c) It speeds up the attainment of equilibrium but does not affect the equilibrium position

d) It shifts the equilibrium towards the reactants

Answer: c) It speeds up the attainment of equilibrium but does not affect the equilibrium position

82. For a reaction at equilibrium, if the pressure is increased, what happens according to Le Chatelier’s principle?

a) The reaction moves in the direction of fewer moles of gas

b) The reaction moves in the direction of more moles of gas

c) The equilibrium constant increases

d) The reaction does not shift

Answer: a) The reaction moves in the direction of fewer moles of gas

83. What is the correct formula for the equilibrium constant K_p in terms of partial pressures?

a) K_p = [products] / [reactants]

b) K_p = P_products / P_reactants

c) K_p = [products] / [reactants]²

d) K_p = [products]² / [reactants]

Answer: b) K_p = P_products / P_reactants

84. Which of the following statements is true for a weak electrolyte?

a) It ionizes completely in water

b) It ionizes partially in water

c) It does not ionize in water

d) It ionizes only in acidic solutions

Answer: b) It ionizes partially in water

85. What is the pH of pure water at 25°C?

a) 7

b) 0

c) 14

d) 10

Answer: a) 7

86. What does the common ion effect refer to?

a) The increase in solubility of salts in water

b) The suppression of ionization of a salt in the presence of a common ion

c) The increase in ionization of acids in solution

d) The effect of changing temperature on solubility

Answer: b) The suppression of ionization of a salt in the presence of a common ion

87. What is the significance of the Gibbs free energy change ΔG in chemical equilibrium?

a) It determines the speed of the reaction

b) It determines the direction of the reaction

c) It determines the rate of the reverse reaction

d) It determines the volume of the system

Answer: b) It determines the direction of the reaction

88. Which of the following acids is considered a Lewis acid?

a) HCl

b) H₂SO₄

c) AlCl₃

d) H₂O

Answer: c) AlCl₃

89. In acid-base equilibrium, which of the following describes the conjugate base of a strong acid?

a) It is weakly basic

b) It does not exist

c) It is a strong base

d) It does not affect the pH

Answer: a) It is weakly basic

90. Which of the following is true for sparingly soluble salts at equilibrium?

a) The solubility product (K_sp) is greater than 1

b) The solubility product (K_sp) is less than 1

c) The solubility product (K_sp) is equal to the concentration of ions in solution

d) The solubility product (K_sp) remains constant only at high temperatures

Answer: b) The solubility product (K_sp) is less than 1

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NEET UG CHEMISTRY Multiple Choice Questions (MCQs)

NEET UG - Physical Chemistry Unit 6: Equilibrium MCQs (76-90)

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