Most Important Long Questions, Chapter 8, Chemical Equilibrium, Class 11 chemistry , 11th Chemistry

Chemical Equilibrium
Important Board Long Questions
Question 1
(a) Define and explain the Law of Mass Action and derive the expression for the Equilibrium Constant.

Question 2
Study the following equilibrium:
PCl5(g) ⇌ PCl3(g) + Cl2(g) (\Delta H = 90 \text{ kJ mol}^{-1})
What is the effect of the following changes? Explain your answer:
i) If temperature is increased.
ii) If the volume of the container is decreased.
iii) If a catalyst is added.
iv) If chlorine (Cl2) is added.

Question 3
Synthesis of ammonia by Haber’s process is an exothermic reaction:
N2(g) + 3H2(g) ⇌ 2NH3(g) (\Delta H = -92.46 \text{ kJ})
What should be the possible effect of a change of temperature at the equilibrium stage?

Question 4
The equilibrium constant (K_c) for the following reaction is 0.016 at 520°C:
2HI(g) ⇌ H2(g) + I2(g)
Initial Equilibrium Data:
HI = 0.08 M
H2 = 0.01 M
I2 = 0.01 M
Scenario: More HI is added to this mixture so that its new concentration is 0.096 M.
What will be the concentrations of HI, H2, and I2 when equilibrium is re-established?

Question 5
The equilibrium constant for the reaction between acetic acid and ethyl alcohol is 4.
A mixture of 3 moles of acetic acid and 1 mole of ethyl alcohol is allowed to come to equilibrium.
Calculate the amount of ethyl acetate present at equilibrium.

Question 6
Study the equilibrium:
H2O(g) + CO(g) ⇌ H2(g) + CO2(g)
i) Write the expression of Kp.
ii) When 1.00 mole of steam and 1.00 mole of CO are allowed to reach equilibrium, 33.3% of the equilibrium mixture is hydrogen.
Calculate the value of Kp and state the units of Kp.

Most Important Long Questions, Chapter 8, Chemical Equilibrium, Class 11 chemistry , 11th Chemistry, gs academy

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