Question

The thermal dissociation equilibrium of $NH _{4} HS ( s )$ is studied under different conditions
$NH _{4} HS ( s ) \rightleftharpoons NH _{3}( g )+ H _{2} S ( g )$
For this equilibrium, the correct statement(s) is (are):

• A. $K$ depends on temperature
• B. $K$ is independent of the initial amount of $NH _{4} HS ( s )$
• C. If pressure of $NH _{3}( g )$ is increased at equilibrium than pressure of $H _{2} S ( g )$ decreases at given temperature.
• D. All option are correct

Answer 1

Answer: (D)

(A) Equilibrium constant depends on temperature

(B) Equilibrium constant is a constant.

(C) $P _{ NH _{3}}$ and $P _{ H _{2} s }$ depend on $K$

(D) $K = p _{ NH_{3} }, \times p _{ H _{2} S }$

so if at equilibrium $p _{ NH_{3}}$ is increased, then automatically $p _{H_{2}s}$ will decrease