Free Reversible Reactions MCQs with Answers
52 Reversible Reactions MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
A reversible reaction proceeds in both forward and backward directions, so reactants and products continue changing until dynamic equilibrium is established. The topic covers the meaning of equilibrium, the equality of forward and reverse rates, and how concentration, pressure and temperature disturb equilibrium, which is separate from the rate at which equilibrium is reached.
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52 questions · page 3 of 3
- A. remains constant
- B. increase
- C. decrease
- D. varies
Explanation: When the pressure of a gaseous mixture in equilibrium increases at constant temperature, the equilibrium constant remains constant.
Correct answer: remains constant- A. 0.05
- B. 0.25
- C. 0.35
- D. 0.45
Explanation: Partial pressure = moles of substance/total moles * total pressure =moles of N2/total moles * total pressure =1/4 * 1 atm = 0.25
Correct answer: 0.25- A. dimension (i.e., with no unit)
- B. mole dm3
- C. mole dm-3
- D. mole2 dm3
Explanation: The correct unit for the reaction N2O4 g → 2NO2 g is mole dm-3, as it represents the concentration of the substances involved in the…
Correct answer: mole dm-3- A. Glass vessel
- B. Iron vessel
- C. Open vessel
- D. Closed vessel
Explanation: At equilibrium, the rate of forward reaction equals the rate of reverse reaction.
Correct answer: Closed vessel- A. When forward and backward reaction taking place at the same rate
- B. Reaction takes place
- C. The forward and backward
- D. There are two reactions with one faster than the other
Explanation: At equilibrium, the rates of the forward and backward reactions are equal, and there is no net change in the concentrations of the…
Correct answer: When forward and backward reaction taking place at the same rate- A. Is the same at different temperature?
- B. Is different at different temperature
- C. Is negligible at room temperature
- D. Can be same at different temperatures
Explanation: The value of K (equilibrium constant) for a reaction can be different at different temperatures.
Correct answer: Is different at different temperature- A. Kc is very large
- B. Kc is very small
- C. Kc is neither very small nor very large
- D. Kc is equal to 1
Explanation: The reaction given is:2Cl(g) \rightleftharpoons Cl_2(g)The equilibrium constant, K_c, is defined as the ratio of the concentrations of the…
Correct answer: Kc is very large- A. Kc = [Ce3+][Fe3+]/[Ce4+][Fe2+]
- B. Kc = [Ce3+][Fe2+]/[Ce4+][Fe3+]
- C. Kc = [Ce4+][Fe3+]/[Ce3+][Fe2+]
- D. Kc = [Ce3+][Fe2+][Ce4+][Fe3+]
Explanation: The correct equilibrium constant expression, Kc, for the given reaction is Kc = [Ce3+][Fe3+]/[Ce4+][Fe2+].
Correct answer: Kc = [Ce3+][Fe3+]/[Ce4+][Fe2+]- A. Raoult's Law
- B. Le Chatelier's Principle
- C. The law of conservation of energy
- D. The law of mass action
Explanation: The correct answer is the law of mass action. This law specifically states that the rate of a chemical reaction is proportional to the…
Correct answer: The law of mass action- A. Kp = Kc
- B. Kp < Kc
- C. Kp > Kc
- D. Kp < 0
Explanation: Kp and Kc are equilibrium constants for reactions involving gases. Kp is used when partial pressures are involved, while Kc is used for…
Correct answer: Kp < Kc- A. Conversion of A to B is 50% complete
- B. 50% reactant has been changed to B
- C. Rate of transformation of A to B is equal to B to A
- D. Complete conversion of A to B has taken place
Explanation: When a chemical reaction is in equilibrium, it means that the rate at which A transforms into B is equal to the rate at which B transforms…
Correct answer: Rate of transformation of A to B is equal to B to A- A. High yield
- B. No yield
- C. Moderate yield
- D. Low yield
Explanation: When the value of K, which represents the equilibrium constant, is very small, it indicates that the reaction has a low yield.
Correct answer: Low yield