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NEET AIPMT SOLVED PAPER SCREENING 2008

  • question_answer
    If the concentration of \[O{{H}^{-}}\]ions in the reaction \[Fe{{(OH)}_{3}}(s)F{{e}^{3+}}(aq)+3O{{H}^{-}}(aq)\]   is decreased by \[\frac{1}{4}\] times, then equilibrium concentration of \[F{{e}^{3+}}\] will increase by

    A) 8 times     

    B)        16 times                              

    C) 64 times

    D) 4 times

    Correct Answer: C

    Solution :

                    Key Idea: The concentration of solids taken to be unity. \[Fe{{(OH)}_{3}}(s)F{{e}^{3+}}(aq)+3O{{H}^{-}}(aq)\] \[\therefore \]\[K=[F{{e}^{3+}}]{{[O{{H}^{-}}]}^{3}}\] Hence, if \[O{{H}^{-}}\]ion concentration is decreased by \[\frac{1}{4}\]times, then equilibrium concentration of \[F{{e}^{3+}}\]will increase by 64 times.


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