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

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asked Mar 31, 2018 in Chemistry by paayal (26,720 points) ● 4 ● 6 ● 11

How do we differentiate between Fe3+ and Cr3+ in group III?
(a) By taking excess of NH4 OH solution
(b) By increasing NH4+ ion concentration
(c) By decreasing OH– ion concentration
(d) Both (b) and (c).

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answered Mar 31, 2018 by sanjaydas (61,430 points) ● 5 ● 7 ● 7

(d) : 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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