A) \[S{{i}_{2}}O_{7}^{6-}\]
B) \[{{(S{{i}_{2}}O_{5}^{2-})}_{n}}\]
C) \[{{(SiO_{3}^{2-})}_{n}}\]
D) \[\frac{\pi }{4}\]
Correct Answer: C
Solution :
[c]
and 
have chain structure of silicates.
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