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Question

How do we differentiate between Fe³⁺ and Cr³⁺ in group III?

Options

A.by taking excess of NH₄OH solution

B.by increasing NH₄⁺ ion concentration

C.by decreasing OH^- ion concentration

D.both (b) and (c)

Solution

NH₄⁺ ions are increased to suppress release of OH^- ions, hence solubility product of Fe(OH)₃ is attained. Colour of precipitate is different.

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