An aqueous solution of hydrogen sulphide shows the equilibrium, \[ \mathrm{H}_{2} \mathrm{~S} \r...
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An aqueous solution of hydrogen sulphide shows the equilibrium,
\[
\mathrm{H}_{2} \mathrm{~S} \rightleftharpoons \mathrm{H}^{+}+\mathrm{HS}^{-}
\]
If dilute hydrochloric acid is added to an aqueous solution of hydrogen sulphide without any change in temperature, then :
(A) the equilibrium constant will change
(B) the concentration of \( \mathrm{HS}^{-} \)will increase
(C) the concentration of undissociated hydrogen sulphide will decrease
(D) the concentration of \( \mathrm{HS}^{-} \)will decrease
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