2024 Re-NEET EquilibriumLe Chatelier's principle - Haber process Medium Question 14 of 104 in Equilibrium

For the reaction in equilibrium $N_2(g)+3H_2(g)\rightleftharpoons2NH_3(g),\ \Delta H=-Q$. Reaction is favoured in forward direction by:

A use of catalyst
B decreasing concentration of $N_2$
C low pressure, high temperature and high concentration of ammonia
D high pressure, low temperature and higher concentration of $H_2$

The answer is D.

Solution

Since the forward reaction is exothermic and involves a decrease in the number of moles of gas, by Le Chatelier's principle it is favoured by high pressure, low temperature, and higher concentration of reactants (e.g. $H_2$). A catalyst only speeds up attainment of equilibrium; it does not shift its position.

Concept Le Chatelier's principle - Haber process

Equilibrium in past papers

104 questions from this chapter have appeared across 27 exam years.