How do we differentiate between Fe^3+ and Cr^3+ in group III?
How do we differentiate between Fe3+ and Cr3+ in group III?
(a) By taking excess of NH4OH solution
(b) By increasing NH4+ ion concentration
(c) By decreasing OH– ion concentration
(d) Both (b) and (c).
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(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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