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Variable Oxidation States

The gas evolv...

Question

The gas evolved on heating $C a F_{2}$ and $S i O_{2}$ with concentrated $H_{2} S O_{4}$ , on hydrolysis gives a white gelatinous precipitate. The precipitate is:

hydrofluorosilicic acid

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silica gel

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silicic acid

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calciumfluorosilicate

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Solution

The correct option is A hydrofluorosilicic acid
Reactions:
$H_{2} S O_{4} + C a F_{2} \to C a (H S O_{4})_{2} + H_{2} F_{2}$

$2 H_{2} F_{2} + S i O_{2} \to S i F_{4} + 2 H_{2} O$

$S i F_{4} + H_{2} O \to H_{2} [S i F_{6}]$

$H_{2} S i F_{6}$ is hydrofluorosilicic acid.

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(A)

(B)

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