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Anionic Radius

Concentrated ...

Question

Concentrated aqueous sodium hydroxide cannot separate a mixture of :

A l^{3 +}

and

S n^{2 +}

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A l^{3 +}

and

F e^{3 +}

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A l^{3 +}

and

Z n^{2 +}

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Z n^{2 +}

and

P b^{2 +}

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Solution

The correct options are
A $A l^{3 +}$ and $S n^{2 +}$
C $Z n^{2 +}$ and $P b^{2 +}$
D $A l^{3 +}$ and $Z n^{2 +}$
Both $A l^{3 +}$ and $F e^{3 +}$ gives white ppt with conc. $N a O H$ as
$A l^{3 +} + 3 N a O H \to A l (O H)_{3}$
white ppt.
$F e^{3 +} + 3 N a O H \to F e (O H)_{3}$
white ppt.
so they can't be separated by this.

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