Question

Identify the reaction which is not affected by increase in pressure.

• A. $N_2\left(g\right)+O_2\left(g\right)\rightleftharpoons 2NO\left(g\right)$
• B. $2{SO}_2\left(g\right)+O_2\left(g\right)\rightleftharpoons 2{SO}_3\left(g\right)$
• C. ${PCl}_5\left(g\right)\rightleftharpoons {PCl}_3\left(g\right)+{Cl}_2\left(g\right)$
• D. $N_2\left(g\right)+{3H}_2\left(g\right)\rightleftharpoons {2NH}_3\left(g\right)$

Answer 1

Answer: (A)

$N_2\left(g\right)+O_2\left(g\right)\rightleftharpoons 2NO\left(g\right)$

According to Le- Chatelier's principle , there is no effect of pressure on equilibrium having same number of moles of gaseous reactants and products.

$N_2\left(g\right)+O_2\left(g\right)\leftrightharpoons 2NO\left(g\right)$

The above reactions have same number of moles of reactants and product.

Therefore, there is no effect of increase in pressure on it.