Question

From the options below which one is Pyrosilicate ion?

• A. $S{i}_2{O}_4^{4-}$
• B. $S{i}_2{O}_7^{6-}$
• C. $S{i}_2{O}_2^{6-}$
• D. $S{i}_2{O}_2^{7-}$

Answer 1

The correct option is B $S{i}_2{O}_7^{6-}$

In these silicates, two tetrahedral units are joined by sharing oxygen at one corner thereby giving $[S{i}_2{O}_7{]}^{6–}$ units.
Hence correct option is b.