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Which of the following anions is present...

Which of the following anions is present in the chain structure of silicates?

A

`SiO_(4)^(4-)`

B

`Si_(2)O_(7)^(6-)`

C

`[Si_(2)O_(5)^(2-)]_(n)`

D

`[SiO_(3)^(2-)]_(n)`

Text Solution

Verified by Experts

The correct Answer is:
D
When each tetetrahedron `(SiO_(4)^(4-))` shares two `O` atoms, infinite chains are formed. The formula of these extended anions approximates to `(SiO_(3))_(n)^(2n-)` or `(SiO_(3)^(2-))_(n)`. `SiO_(4)^(4-)` anion is present in orthosilicates. `Si_(2)O_(7)^(6-)` anion is present in pyrosilicates, while `(Si_(2)O_(5)^(2-))_(n)` anion is present in double-chain silicates as well as in sheet silicates.
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