Question

The following reaction attains equillibrium at high temperatures:
$N_2\left(g\right)+2H_{2}O\left(g\right)+heat\rightleftharpoons 2NO\left(g\right)+2H_2\left(g\right)$
The concentration of $NO\left(g\right)$ is not affected by:

• A. Increasing the nitrogen concentration
• B. Decreasing the hydrogen concentration
• C. Compressing the reaction mixture
• D. Addition of a catalyst

Answer 1

The correct option is D Addition of a catalyst

According to Le-Chatelier's principal in the above reaction,
Increasing the nitrogen concentration and decreasing the hydrogen concentration will result in a forward reaction. Compressing the reaction mixture means that we are decreasing the volume, which will result in an increase in the concentration and hence the reaction will shift in the direction where gaseous moles is less. So, the reaction will move backwards.
Addition of catalyst will help to achieve equillibrium faster. It doesnt affect the concentration of the reactant or the product.