SolutionHard
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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