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Arrhenius Acid

Three test-tu...

Question

Three test-tubes $A, B, C$ contain $P b^{2 +}, H g_{2}^{2 +}$ and $A g^{+}$ (but unknown). To each aqueous solution $N a O H$ is added in excess. Following changes occur in following tes-tubes :
A : black precipitate
B : brown precipitate
C : white ppt. but dissolves in excess of $N a O H$ .
$A, B$ and $C$ respectively contain:

A

P b^{2 +}, H g_{2}^{2 +}

and

A g^{+}

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B

H g_{2}^{2 +}, A g^{+}, P b^{2 +}

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C

A g^{+}, P b^{2 +}, H g_{2}^{2 +}

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D

A g^{+}, H g_{2}^{2 +}

and

P b^{2 +}

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Solution

The correct option is B $H g_{2}^{2 +}, A g^{+}, P b^{2 +}$
Black finely divided mercury metal and yellow mercury(II) oxide $(H g O)$ are precipitated by $N a O H$ :
$H g_{2}^{2 +} (a q) + 2 O H^{-} (a q) \to H g (l)$ (black) $+ H g O$ (yellow) $+ H_{2} O (l)$
$A g^{+} + N a O H \to A g O H + N a^{+}$
$2 A g O H \to A g_{2} O$ (Brown ppt) $+ H_{2} O$
$P b^{2 +} + N a O H \to P b (O H)_{2}$
$P b (O H)_{2} \to P b O$ (white ppt) $+ H_{2} O$
$P b O +$ excess $N a O H \to$ does not dissolve.

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