Silica is soluble in :

H C l

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H N O_{3}

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H_{2} S O_{4}

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H F

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Solution

The correct option is B $H F$
Hydrofluoric add, $H F$ is the only add in which Silica $(S i O_{2})$ is soluble due to the formation of silicon tetrafluoride as
$S i O_{2} + 4 H F \to S i F_{4} + 2 H_{2} O$

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Find the odd-man-out.

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$Z n$ gives $H_{2}$ gas with $H_{2} S O_{4}$ and $H C l$ but not with concentrated $H N O_{3}$ because

HCl, H_{2} {SO}_{4} and {HNO}_{3}

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