The following equilibrium exists in an aqueous solution of hydrog… - Vidyadip

MCQ

The following equilibrium exists in an aqueous solution of hydrogen sulphide : ${H_2}S $ $\rightleftharpoons$ $ {H^ + } + H{S^ - }$

If dilute $HCl$ is added to an aqueous solution of ${H_2}S$ without any change in temperature

A
The equilibrium constant will change
B
The concentration of $H{S^ - }$will increase
C
The concentration of undissociated ${H_2}S$ will decrease
✓
The concentration of $H{S^ - }$will decrease

✓

Answer

Correct option: D.

The concentration of $H{S^ - }$will decrease

(d) In aqueous solution following euilibrium is exist. ${H_2}S⇌{H^ + } + H{S^ - }$
While adding the dilute $HCl $ solution

$(HCl⇌{H^ + } + C{l^ - })$ equilibrium is shift to the left side in ${H_2}S⇌{H^ + } + H{S^ - }$

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