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JEE Main levelSingle correct optionDifficulty 2 of 3pb150

Silica is attacked by which one of the following acids?

AHCl
B $H X_{2} SO X_{4}$
C $HNO X_{3}$
DHF

Answer: D

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

(and with excess HF,

H X_{2} SiF X_{6}

); the strong Si-F bond drives it. Other mineral acids do not attack silica.

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