Previous Year NEET Question- Chemical Equilibrium-1

Q1. The answer is (B).

The relation between Kp and Kc is:

Kp = Kc (RT)∆n

where ∆n is the difference in the number of moles of gaseous products and gaseous reactants.

In this reaction, ∆n = 2 - (1 + 3) = -2

So, Kp = Kc (RT)-2

Kp = (1.44 × 10-5) (0.0821 × 400)-2 = 3.1 × 10-10.

Q2. A mixture of 1.0 mole of CO and 1.0 mole of H2, in a 1.0 L flask, is heated to 727 °C. At equilibrium, the concentration of CO is 0.25 M. What is the equilibrium concentration of H2?

The answer is 1.75 M.

The balanced chemical equation is:

CO(g) + H2O(g) ⇌ CO2(g) + H2(g)

The equilibrium constant expression is:

Kc = [CO2]