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(B) Concentrated $NaOH$ solution can separate metal ions based on the amphoteric nature of their hydroxides. $Al^{3+}$,$Cr^{3+}$,$Zn^{2+}$,and $Pb^{2+

Vedclass · Accepted Answer

$Cr^{3+}$ and $Fe^{3+}$

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(B) Concentrated $NaOH$ solution can separate metal ions based on the amphoteric nature of their hydroxides. $Al^{3+}$,$Cr^{3+}$,$Zn^{2+}$,and $Pb^{2+}$ form amphoteric hydroxides that dissolve in excess $NaOH$ to form soluble complexes. $Fe^{3+}$ forms a basic hydroxide,$Fe(OH)_3$,which is insoluble in excess $NaOH$. Therefore,a mixture of $Cr^{3+}$ (amphoteric) and $Fe^{3+}$ (basic) can be separated using concentrated $NaOH$.

Column $I$	Column $II$
$A$. Cyanide process	$i$. Ultrapure $Ge$
$B$. Froth floatation	$ii$. Dressing of $ZnS$
$C$. Electrolytic reduction	$iii$. Extraction of $Al$
$D$. Zone refining	$iv$. Extraction of $Au$
	$v$. Purification of $Ni$

Concentrated sodium hydroxide can separate a mixture of

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