Question

Which of the following is incorrect about anionic unit of pyrosilicate?

• A. It has one oxygen shared between two $Si{O}_4^{4-}$ tetrahedra
• B. Negative charge is present on Si atom
• C. The O/Si ratio is 3.5 : 1
• D. All of the above.

Answer 1

The correct option is B Negative charge is present on Si atom

In these silicates, two tetrahedral units are joined by sharing oxygen at one corner thereby giving $[S{i}_2{O}_7{]}^{6-}$ units.
In case of pyrosilicates, negative charge will be present on the oxygen atoms which is bonded with one Si atom.

Hence, correct option is b.