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Which of the following anion is present in the chain structure of silicates?
A. |
`(Si_2O_5^(2-))_n` |
B. |
`(Si_2O_3^(2-))_n` |
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C. |
`Si_2O_4^(4-)` |
D. |
`Si_2O_7^(6-)` |