Equilibrium class 11/ kp and kc / Relation between Kp and Kc / subjective questions 

Q.1.Derive relation between KP & KC?
Q.2.Write the expression of KP for the following reaction
Cu(NO3)2(s) ⇌ 2CuO(s) + 4NO2(g) + O2(g)
Q3.The relation between KP & KC for the following is
H2 + I2 ⇌ 2HI
Q4.The ratio of KP & KC for the following reaction at 25C is
2SO2(g) + O2(g) ⇌ 2SO3(g)
Q5.For the following reaction in gaseous phase CO + 1/2 O2  CO2 ; Kp / Kc is
(a) (RT)1/2
(b) (RT)-1/2
(c) (RT)
(d) (RT)-1
Q6.NH4HS(s) ⇌ NH3(g) + H2S(g)
If KP = 64 atm2, equilibrium pressure of mixture is
(a) 8 atm
(b) 16 atm
(c) 64 atm
(d) 256 atm
Q7.In which of the following reaction, the value of Kp will be equal to Kc
(a) H2 + I2 ⇋ 2HI
(b) PCl5 ⇋ PCl3 + Cl2
(c) 2NH3 ⇋ N2 + 3H2
(d) 2SO2 + O2 ⇋ 2SO3
Questions on kp and kc
1. What will be the value of Kp if the Kc is 26 for a reaction, PCl5 ⇌ PCl3 + Cl2 at 25o°?
0.57
0.46
0.83
0.61
Answer: (d)
2. For which of the following reactions Kp is less than Kc?
2HI ⇌ H2 + I2
N2 + O2 ⇌ 2NO
N2O4 ⇌ 2NO2
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
3.75 mol/L
0.533 mol/L
0.267 mol/L
None of the above
Answer: (c)
4. When Q (concentration quotient) is smaller than equilibrium constant
reaction will be in equilibrium
reaction will proceed in forward direction
reaction will proceed in backward direction
none of the above
Answer: (b)
5. Active mass in the law of mass action is
molar concentration
absolute concentration
concentration at 0oC
molar mass
Answer: (a)
6. The mass of a gas dissolved in a given mass of a solvent at any temperature is directly proportional to
pressure of gas
volume of gas
density of gas
none of above
Answer: (a)
7. Which of the following is an example of solid-solution equilibrium?
dissolution of sugar in water
melting of ice
evaporation of water in a closed vessel
none of the above
Answer: (a)