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                                                                                                                                                              [AIPMT (S) 2008]

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.

Hence, if ion concentration is decreased by times, then equilibrium concentration of will increase by 64 times.