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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+

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$Cr^{3+}$ 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 $NaOH$.

Concentrated sodium hydroxide can separate a mixture of

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