Physical Chemistry - Equilibrium
Q. For the equilibrium reaction 2SO2(g) + O2(g) ⇌ 2SO3(g), what is the effect of decreasing the volume of the container? (2021)
A.
Shift to the left
B.
Shift to the right
C.
No effect
D.
Increase in temperature
Show solution
Solution
Decreasing the volume increases the pressure, and according to Le Chatelier's principle, the equilibrium will shift towards the side with fewer moles of gas, which is the right side in this case.
Correct Answer: B — Shift to the right
Learn More →
Q. For the reaction N2(g) + 3H2(g) ⇌ 2NH3(g), what is the expression for the equilibrium constant Kp? (2020)
A.
(P_NH3)^2 / (P_N2)(P_H2)^3
B.
(P_N2)(P_H2)^3 / (P_NH3)^2
C.
(P_NH3)^2 (P_N2)(P_H2)^3
D.
(P_N2)(P_H2)^3 (P_NH3)^2
Show solution
Solution
Kp is expressed in terms of the partial pressures of the gases involved in the reaction. For this reaction, Kp = (P_NH3)^2 / (P_N2)(P_H2)^3.
Correct Answer: A — (P_NH3)^2 / (P_N2)(P_H2)^3
Learn More →
Q. In a reaction at equilibrium, if the concentration of a reactant is increased, what will happen to the equilibrium position? (2019)
A.
Shift to the right
B.
Shift to the left
C.
No change
D.
Depends on temperature
Show solution
Solution
Increasing the concentration of a reactant will shift the equilibrium position to the right, favoring the formation of products.
Correct Answer: A — Shift to the right
Learn More →
Q. In a reversible reaction, if the forward reaction is exothermic, what can be said about the reverse reaction? (2022)
A.
It is also exothermic
B.
It is endothermic
C.
It has no effect on equilibrium
D.
It is spontaneous
Show solution
Solution
If the forward reaction is exothermic, the reverse reaction must be endothermic, as it absorbs heat.
Correct Answer: B — It is endothermic
Learn More →
Q. What happens to the equilibrium position when a catalyst is added to a reaction at equilibrium? (2023)
A.
Shifts to the right
B.
Shifts to the left
C.
No change
D.
Increases Kc
Show solution
Solution
A catalyst speeds up both the forward and reverse reactions equally, thus it does not change the position of equilibrium or the value of Kc.
Correct Answer: C — No change
Learn More →
Q. What is the effect of increasing the temperature on the equilibrium constant Kc for an endothermic reaction? (2023)
A.
Kc decreases
B.
Kc increases
C.
Kc remains constant
D.
Kc becomes zero
Show solution
Solution
For an endothermic reaction, increasing the temperature shifts the equilibrium to the right, thus increasing the value of Kc.
Correct Answer: B — Kc increases
Learn More →
Showing 1 to 6 of 6 (1 Pages)
