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^{-}} $



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