JEE Main & Advanced Chemistry Equilibrium Question Bank Common ion effect, Isohydric solutions, Solubility product, Ionic product of water and salt hydrolysis

  • 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

    Correct Answer: D

    Solution :

               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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