Question

The simplest ion of Pyro-silicates is:

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

Do you remember about Pyro-silicates?

These involve discrets $Si{O}_4^{4-}$ units in which the $Si{O}_4$ tetrahedra share one oxygen atom. The simplest ion of this type is $S{i}_2{O}_7^{6-}$ ion. These are also known as island silicates.

The basic structure of Ortho-silicate is $Si{O}_4^{4-}$ but here we are sharing one oxygen, Therefore, for pyrosilicate,

$\to$ Twice (every element) minus One oxygen $\stackrel{`}{a}$ 2 Si, 7 oxygen

$\to$ There are six charge centres.

Therefore, $S{i}_2{O}_7^{6-}$