Q.

Excess of concentrated sodium hydroxide can separate mixture of

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a

Al3+ and Cr3+

b

Cr3+ and Fe3+

c

Al3+ and Zn2+

d

Zn2+ and Pb2+

answer is B.

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Detailed Solution

Al3+,Zn2+ and Cr3+ form a soluble complex with excess of NaOH, whereas Fe3+ does not.
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