Reversible And Irreversible Reaction MCQs

Some reactions are termed reversible because they can occur in both the forward and reverse directions. The synthesis of ammonia is an example of a reversible reaction. A reversible process occurs through an infinite number of steps, maintaining equilibrium conditions at each stage. In such a process, the opposing force is infinitesimally smaller than the driving force. Conversely, an irreversible process happens rapidly, causing the system to lose equilibrium. All natural processes are irreversible.

Which of the following represents the largest amount of energy?

(a) 1 electron volt
(b) 1 erg
(c) 1 calorie
(d) 1 joule

One litre atmosphere is approximately equal to

(a) 101 J
(b) 8.314 J
(c) 931 J
(d) 19.2 J

The net energy change in a reversible cyclic process is

(a) 3/2 RT
(b) zero
(c) always > 0
(d) always < 0

The enthalpy change for a given reaction at 298K is -x J/mol. If the reaction occurs spontaneously at 298K, the entropy change at that temperature

(a) can be negative but larger than x/298
(b) can be negative but smaller than x/298
(c) cannot be negative
(d) cannot be positive

The initial energy change (𐤃U) of a process does not depend upon

(a) amount of substance undergoing the change
(b) temperature
(c) path of the process
(d) nature of substance undergoing the change

Which of the following is an extensive property?

(a) temperature
(b) pressure
(c) mass/volume ratio
(d) energy

The total entropy change for a system and its surroundings increases if a process is

(a) exothermic
(b) endothermic
(c) reversible
(d) irreversible

The mixing of gases is generally accompanied by

(a) decrease in entropy
(b) a decrease in free energy
(c) change in heat content
(d) increase in free energy

Vibrational energy is

(a) partial potential and partly kinetic
(b) only potential
(c) only kinetic
(d) neither kinetic nor potential

Which of the following is correct for an adiabatic process?

(a) 𐤃E = q
(b) q = 0
(c) q = +w
(d) P𐤃V = 0