Which one of the following statements about the zeolite is false?

Options

A. They have open structure which enables them to take up small molecules
B. Zeolites are aluminosilicates having three dimensional network
C. Some of the `SiO_4^(4-)` units are replaced by `AlO_4^(5-)` and `AlO_4^(4-)` ions in zeolites
D. They are used as cation exchangers

Answer

C