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NEET Sample Paper NEET Sample Test Paper-12

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

    A)  16 times                      

    B)  64 times

    C)  4 times                        

    D)  8 times

    Correct Answer: B

    Solution :

     \[{{K}_{e}}=[F{{e}^{3+}}]{{[O{{H}^{-}}]}^{3}}\] If\[\,[O{{H}^{-}}]=\frac{1}{4}\times [O{{H}^{-}}]\] initial, then \[[F{{e}^{3+}}]\] \[=64{{[F{{e}^{3+}}]}_{\text{initial}}}\]to have\[{{K}_{c}}\]


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