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Question

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

A
HI
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B
HF
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C
HCl
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D
HBr
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Solution

The correct option is D HF
Hydrofluoric acid reacts with silica (SiO2) present in the glass (an important constituent of glass) to form soluble hydrofluorosilicic acid. That's why it is not stored in glass bottles.

SiO2Fromglass+4HFSiF4+2H2O

SiF4+2HFH2SiF6Hydrofluorosilicicacid

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