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MolSynapse / Question bank / p-Block Elements: Groups 13 and 14 / Silicon compounds: silicates, silicones, zeolites

NEET levelSingle correct optionDifficulty 1 of 3pb077

Silica ( $SiO X_{2}$ ) is attacked by which one of the following acids?

A $H X_{2} SO X_{4}$
B $HCl$
C $HNO X_{3}$
D $HF$

Answer: D

Silica is unreactive towards common acids but reacts with hydrofluoric acid:

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

, with excess HF giving

H X_{2} SiF X_{6}

. This is why HF is stored in plastic and not glass bottles.

Practice p-Block Elements: Groups 13 and 14 More on Silicon compounds: silicates, silicones, zeolites

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