Aqueous solution of which of the following acid cannot be kept in glass bottle ?

H I

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H F

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H C l

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H B r

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Solution

The correct option is D $H F$
Hydrofluoric acid reacts with silica $(S i O_{2})$ present in the glass (an important constituent of glass) to form soluble hydrofluorosilicic acid. That's why it is not stored in glass bottles.

$S i O_{2} F r o m g l a s s + 4 H F \to S i F_{4} + 2 H_{2} O$

$S i F_{4} + 2 H F \to H_{2} S i F_{6} H y d r o f l u o r o s i l i c i c a c i d$

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