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Zinc Ion

Which of the ...

Question

Which of the following mixtures can be separated by using an $N H_{3}$ solution?

F e^{3 +}

and

A l^{3 +}

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A l^{3 +}

and

Z n^{2 +}

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S n^{2 +}

and

P b^{2 +}

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C u^{2 +}

and

C d^{2 +}

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Solution

The correct option is B $A l^{3 +}$ and $Z n^{2 +}$

$N H_{3} + H_{2} O \to N H_{4}^{+} + O H^{-}$

$A l + 3 O H^{-} \to A l (O H)_{3}$

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