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  3. RAJASTHAN ­ PET

RAJASTHAN ­ PET Rajasthan PET Solved Paper-2004

  • question_answer
    The equilibrium of aqueous solution of\[{{H}_{2}}S\]is as \[{{H}_{2}}S{{H}^{+}}+H{{S}^{-}}\] On adding\[HCl\]at equilibrium

    A)  concentration of\[H{{S}^{-}}\]will increase

    B)  concentration of\[H{{S}^{-}}\]will decrease

    C)  dissociation of\[{{H}_{2}}S\]will increase

    D)  dissociation of\[{{H}_{2}}S\]will stop

    Correct Answer: B

    Solution :

     \[{{H}_{2}}S{{H}^{+}}+H{{S}^{-}}\] On adding\[HCl\] \[HCl\underset{common-ion}{\mathop{{{H}^{+}}+C{{l}^{-}}}}\,\] Hence, on adding\[HCl\]at equilibrium the concentration of\[H{{S}^{-}}\]ion will decrease due to common-ion effect.


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