Equilibrium Question 231
Question: The following equilibrium exists in an aqueous solution of hydrogen sulphide : $ H_2S $ ⇄ $ {H^{+}}+H{S^{-}} $ If dilute $ HCl $ is added to an aqueous solution of $ H_2S $ without any change in temperature [NCERT 1989]
Options:
A) The equilibrium constant will change
B) The concentration of $ H{S^{-}} $ will increase
C) The concentration of undissociated $ H_2S $ will decrease
D) The concentration of $ H{S^{-}} $ will decrease
Show Answer
Answer:
Correct Answer: D
Solution:
In aqueous solution following euilibrium is exist. $ H_2S $ ⇌ $ {H^{+}}+H{S^{-}} $ While adding the dilute HCl solution $ (HCl $ ⇌ $ {H^{+}}+C{l^{-}}) $ equilibrium is shift to the left side in $ H_2S $ ⇌ $ {H^{+}}+H{S^{-}} $
