Question

Consider the following statements.
In the Haber's method of synthesis of ammonia:
1. An increase of pressure favours the formation of ${NH}_3$
2. A decrease of pressure produces more ${NH}_3$
3. An increase of temperature dissociates ${NH}_3$
4. Addition of inert gas at constant pressure favors the formation of ${NH}_3$
Which of the statements given above are correct?

• A. 1 and 3
• B. 2 and 4
• C. 1 and 4
• D. 2 and 3

Answer 1

Answer: (A)

1 and 3

In Haber's method of sunthesis of ${NH}_3:-$

$N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2{NH}_3\left(g\right),△H=-92.4KJ/mol$

Effect of pressure :- In this reaction, proceed reaction is accompanied by decrease in total no. of moles. If pressure is increased then, by Le Chatelier's principle, the equilibrium will shift in direction of formation of ammonia.

Effect of temperature :- The forward reaction is exothermic in nature, So, If temperature is increased then according to Le Chatelier's principle the equilibrium shift in backward direction.