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Coordination Complexes

Which of the ...

Question

Which of the following mixtures of ions can be separated by using an excess of an NaOH solution?

P b^{2 +}

and

Z n^{2 +}

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A l^{3 +}

and

Z n^{2 +}

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F e^{3 +}

and

A l^{3 +}

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S n^{2 +}

and

P b^{2 +}

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Solution

The correct option is C $F e^{3 +}$ and $A l^{3 +}$
With sodium hydroxide solution, a reddish-brown precipitate of iron(III) hydroxide, insoluble in excess of the reagent (distinction from aluminium and chromium) is obtained.

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