Which statement about zeolite is false ?

Options

A. They are used as cation exchangers
B. They have open structure which enables them to take up small molecules
C. Zeolites are aluminosilicates having three dimensional network
D. None of the `SiO_(4)^(4-)` units are replaced by `AlO_(4)^(5-)` and `AlO_(6)^(9-)` ions in zeolites.

Answer

D

Explanation

Zeolites have `SiO_(4)^(4-)` and `AlO_(4)^(5-)` tetrahedron, linked together in a three dimensional open structure in which four or six membered rings predominate. Due to open chain structure, they have cavities and can take up water and small molecules.