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MolSynapse / Question bank / p-Block Elements: Groups 17 and 18 / Halogen compounds: HX, oxoacids, bleaching powder

NEET levelSingle correct optionDifficulty 1 of 3ph009

Hydrofluoric acid cannot be stored in glass bottles because

A $HF$ is a very strong oxidising agent
B $HF$ reacts with the oxygen of air to form $F X_{2}$
C $HF$ attacks the silica ( $SiO X_{2}$ ) and silicates in glass
D $HF$ polymerises on glass surfaces

Answer: C

SiO X_{2} + 4 HF SiF X_{4} + 2 H X_{2} O

, so glass is etched. Hence HF is kept in wax, plastic or lead containers.

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