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(D) Both $Al^{3+}$ and $Fe^{3+}$ form precipitates with $NaOH$ solution.$Al^{3+} + 3OH^- \rightarrow Al(OH)_3 \downarrow$ (white precipitate)$Fe^{3+}

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$Al^{3+}, Fe^{3+}$

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(D) Both $Al^{3+}$ and $Fe^{3+}$ form precipitates with $NaOH$ solution.$Al^{3+} + 3OH^- \rightarrow Al(OH)_3 \downarrow$ (white precipitate)$Fe^{3+} + 3OH^- \rightarrow Fe(OH)_3 \downarrow$ (brown precipitate)$Al(OH)_3$ is amphoteric in nature and dissolves in excess $NaOH$ to form a soluble complex,$Na[Al(OH)_4]$,whereas $Fe(OH)_3$ is basic and does not dissolve in excess $NaOH$.Therefore,$Al^{3+}$ and $Fe^{3+}$ can be separated using concentrated aqueous $NaOH$.

Concentrated aqueous $NaOH$ can separate a mixture of

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