MCQs on Kp And Kc Relationship And Characteristics Of K
1. What will be the value of Kp if the Kc is 26 for a reaction, PCl5 ⇌ PCl3 + Cl2 at 25o°?
(a) 0.57
(b) 0.46
(c) 0.83
(d) 0.61
Answer:::: (d)
2. For which of the following reactions Kp is less than Kc?
(a) 2HI ⇌ H2 + I2
(b) N2 + O2 ⇌ 2NO
(c) N2O4 ⇌ 2NO2
(d) 2SO2 + O2 ⇌ 2SO3
Answer:::: (d)
3. Two moles of PCl5 were heated to 400oC in 2 litres closed vessel. At equilibrium, 40% of PCl5 was dissociated into PCl3 and Cl2. Its Kc will be
(a) 3.75 mol/L
(b) 0.533 mol/L
(c) 0.267 mol/L
(d) None of the above
Answer:::: (c)
4. Which of the following is not correct?
(a) large value of K indicates large amount of products
(b) small value of K indicates large amount of reactants
(c) for K < 1 amount of reactants > amount of products
(d) none of the above
Answer:::: (d)
5. When Q (concentration quotient) is smaller than equilibrium constant
(a) reaction will be in equilibrium
(b) reaction will proceed in forward direction
(c) reaction will proceed in backward direction
(d) none of the above
Answer:::: (b)
6. If Kp and Kc are in equilibrium constants in terms of partial pressure and concentration
(a) Kp = Kc/RT
(b) Kp = KcRT
(c) Kp = Kc/(RT)𐤃n
(d) Kp = Kc(RT)𐤃n
Answer:::: (d)
7. For a reaction in equilibrium
(a) Q (concentration quotient) = K (equilibrium constant)
(b) Q > K
(c) Q < K
(d) none of the above
Answer:::: (a)
8. Active mass in the law of mass action is
(a) molar concentration
(b) absolute concentration
(c) concentration at 0oC
(d) molar mass
Answer:::: (a)
9. The mass of a gas dissolved in a given mass of a solvent at any temperature is directly proportional to
(a) pressure of gas
(b) volume of gas
(c) density of gas
(d) none of above
Answer:::: (a)
10. Which of the following is an example of solid-solution equilibrium?
(a) dissolution of sugar in water
(b) melting of ice
(c) evaporation of water in a closed vessel
(d) none of the above
Answer:::: (a)
