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(C) When a mixture of $Cr^{3+}$ and $Fe^{3+}$ is treated with concentrated $NaOH$,$Cr^{3+}$ forms a soluble complex,while $Fe^{3+}$ forms an insoluble

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

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(C) When a mixture of $Cr^{3+}$ and $Fe^{3+}$ is treated with concentrated $NaOH$,$Cr^{3+}$ forms a soluble complex,while $Fe^{3+}$ forms an insoluble precipitate.For $Cr^{3+}$:$Cr^{3+} + 3OH^{-} \longrightarrow Cr(OH)_3 \downarrow$$Cr(OH)_3 + OH^{-} \longrightarrow [Cr(OH)_4]^{-} 	ext{ (soluble green complex)}$For $Fe^{3+}$:$Fe^{3+} + 3OH^{-} \longrightarrow Fe(OH)_3 \downarrow 	ext{ (brown precipitate)}$Since $Cr^{3+}$ remains in the solution as a complex and $Fe^{3+}$ precipitates out as $Fe(OH)_3$,they can be separated by filtration.

Concentrated sodium hydroxide can separate a mixture of

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