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Hydrochloric Acid

One or more o...

Question

One or more of the following substances viz $B a C l_{2}, N a_{2} S O_{4}, C a C O_{3}, N a O H a n d Z n S O_{4}$ are present in a mixture. On dissolving the mixture in water, a clear solution is obtained which
gives a pink colour with phenolphthalein. To the solution dilute $H C l$ is added gradually when a precipitate is formed initially which dissolves in excess. The composition of the mixture is:

B a C l_{2} a n d N a O H

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Z n S O_{4} a n d N a O H

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C a C O_{3} a n d N a_{2} S O_{4}

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B a C l_{2} a n d N a_{2} S O_{4}

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Solution

The correct option is B $Z n S O_{4} a n d N a O H$
The solution is alkaline and gives a pink colour with phenolphthalein. Hence it must be strongly alkaline and must contain $N a O H$ .
The aqueous solution gives a white precipitate with dil $H C l$ initially and on adding excess of $H C l$ it dissolves This suggest that $Z n^{2 +}$ must be present in the solution.
$Z n S O_{4} + 4 N a O H \to N a_{2} Z n O_{2} + N a_{2} S O_{4} + 2 H_{2} O$
(Soluble)
$N a_{2} Z n O_{2} + 2 H C l \to 2 N a C l + Z n (O H)_{2} ↓$
$Z n (O H)_{2} + 2 H C l \to Z n C l_{2} + 2 H_{2} O$
(Excess) (Soluble)

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