Question

For the reaction

H₂(g) + I₂(g) ⇋ 2HI(g) the equilibrium constant k_p changes with  

(a) total pressure 

(b) catalyst 

(c) the amounts of H₂ and I₂, present 

(d) temperature

Answer 1

The correct option (d)  temperature

Explanation:

H₂(g) + I₂(g) ⇋ 2HI(g)

'.' Number of moles of product

= number of moles of reactant

∴ No effect of  pressure. 

Catalyst increase the rate of forward as well as rate of backward reaction, thus does not affect K_p. 

As the amount of reactant decreases / increases, in the same proportion the amount of product decreases / increases, so K_p does not depend on the amounts of H₂ and I₂. 

Hence, K_p depends only on temperature.