Which is the anhydride of orthosilicic acid?

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SiO

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S i O_{2}

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S i O_{3}

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Solution

The correct option is B $S i O_{2}$
Orthosilicic acid is $H_{4} S i O_{4}$ . The anhydride of this acid polymerizes to form $S i O_{2}$ .

$H_{4} S i O_{4} - 2 H_{2} O - --- \to S i O_{2}$

Hence, option C is correct.

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Among $A l_{2} O_{3}, S i O_{2}, P_{2} O_{3}, a n d S O_{3}$ the correct order of acid strength is

H F

({N a}_{2} {S i O}_{3})

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