A) \[9{{x}^{3}}\]
B) \[3{{x}^{3}}\]
C) \[27{{x}^{4}}\]
D) \[9{{x}^{4}}\]
Correct Answer: C
Solution :
Dissociation of \[\text{Fe(OH}{{\text{)}}_{\text{3}}}\]in solution is represented as follows \[\underset{(-x)}{\mathop{Fe{{(OH)}_{3}}}}\,\rightleftharpoons \underset{(x)}{\mathop{F{{e}^{3+}}}}\,+\underset{(3x)}{\mathop{3O{{H}^{-}}}}\,\] \[{{K}_{sp}}=x\times {{(3x)}^{3}}=27{{x}^{4}}\]
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