Question

Consider the equilibrium $N{H}_{4}Cl\left(s\right)\rightleftharpoons N{H}_3\left(g\right)+HCl\left(g\right)$. An inert gas is added to the system at constant volume and temperature. The correct statement(s) is/ are:

• A. the partial pressures of $N{H}_3$ and $HCl$ in the system will increase
• B. the partial pressures of $N{H}_3$ and $HCl$ in the system will remain the same
• C. the partial pressures of $N{H}_3$ and $HCl$ in the system will decrease
• D. the entropy of the system will increase

Answer 1

Answer: (B), (D)

the partial pressures of $N{H}_3$ and $HCl$ in the system will remain the same
the entropy of the system will increase

$N{H}_4$ $+$ $Cl\left(s\right)$ $\rightleftharpoons$ $N{H}_3\left(g\right)$ $+$ $HCl$.

Noble gas are inert hence adding inert gas doesn't effect the partial pressure.

This is because noble gas gets added to both reactant and product.

$X\left(g\right)$ $+$ $N{H}_{4}Cl\left(S\right)$ $\rightleftharpoons$ $N{H}_3\left(g\right)$ $+$ $HCl\left(g\right)$ $+$ $X\left(g\right)$

Where X=Noble gas

Hence the partical presence of $N{H}_3$ and $HCl$ will remain same.

The amount of gas in the system will increase after adding inert gas.

Since gases has high entropy than liquid and solid, the entropy of the system will increase.