Silica dissolves readily in:

H F

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H C l

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H B r

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H N O_{3}

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Solution

The correct option is A $H F$
Silica is very non-reactive in its normal form and resists the attacks by acids, metals and halogens. However, it reacts with HF and NaOH.

The reactions are respectively:

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

$S i O_{2} + 2 N a O H \to N a_{2} S i O_{3} + H_{2} O$
Hence, option A is correct.

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H N O_{3}

H C l

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