Question

The reaction quotient $Q$ for:
$N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2{NH}_3\left(g\right)$
is given by $Q=\frac{{\left[{NH}_3\right]}^2}{\left[N_2\right]{\left[H_2\right]}^3}$. The reaction will proceed in backward direction, when:

• A. $Q=K_c$
• B. $Q<K_c$
• C. $Q>K_c$
• D. $Q=0$

Answer 1

The correct option is C $Q>K_c$

The reaction quotient $Q$ for:

$N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2{NH}_3\left(g\right)$

is given by $Q=\frac{{\left[{NH}_3\right]}^2}{\left[N_2\right]{\left[H_2\right]}^3}$. The reaction will proceed in backward direction, when $Q>K_c$. The product concentration is more than equilibrium value.
The reactant concentration is less than the equilibrium value.

Hence, the correct option is C.