Question

For the reaction,
$N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2{NH}_3\left(g\right)+Heat$
When temperature increases, then:

• A. the formation of ${NH}_3$ increases
• B. the formation of ${NH}_3$ decreases
• C. the concentration of $N_2$ decreases
• D. the concentration of $H_2$ decreases

Answer 1

The correct option is B the formation of ${NH}_3$ decreases

For the reaction,
$N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2{NH}_3\left(g\right)+Heat$
When temperature increases formation of ${NH}_3$ decreases.
The forward reaction is an exothermic reaction. With the increase in temperature, heat is added to the reaction. The equilibrium will shift in the reverse direction so that added heat is consumed during the reverse reaction. This will nullify the effect of added heat.