• # question_answer The following equilibrium exists in an aqueous solution of hydrogen sulphide :                 ${{H}_{2}}S$ ⇄ ${{H}^{+}}+H{{S}^{-}}$ If dilute $HCl$ is added to an aqueous solution of ${{H}_{2}}S$ without any change in temperature     [NCERT 1989] A)                 The equilibrium constant will change B)                 The concentration of $H{{S}^{-}}$will increase C)                 The concentration of undissociated ${{H}_{2}}S$ will decrease D)                 The concentration of $H{{S}^{-}}$will decrease

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 ${{H}_{2}}S$⇌${{H}^{+}}+H{{S}^{-}}$