The structures of quartz, mica, asbestos have the common basic unit of-

(S i O_{4})^{4 -}

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(S i O_{3})^{2 -}

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(S i O_{4})^{2 -}

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(S i_{3} O_{2})^{2 -}

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Solution

The correct option is A $(S i O_{4})^{4 -}$
Quartz, mica and asbestos are different type of silicates but all these share common basic unit, $S i O_{4}^{4 -}$ .

Such tetrahedral units ( $S i O_{4}^{4 -}$ ) are linked together in different ways to give, chains, rings, sheets and three dimensional network.

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Asbestos $[C a M g_{3} O (S i_{4} O_{11})]$ which is a type of amphibole has a general structure as:

S i - O - S i

S i

A l

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