Which of the following statements about the zeolites is false?

Options

A. They are used as cation exchangers
B. They have open structures which enables them to take up small molecules
C. They are aluminosilicates having three dimensional network
D. In zeolites some of rthe `SiO_(4)^(4-)` anions are replaced by `AlO_(4)^(5-)` and `AlO_(6)^(9-)` ions.

Answer

D

Explanation

Only tetrahedral `AlO_(4)^(5-)` ions which have nearly the same size as the tetrahedral `SiO_(4)^(4-)` anions can replace the latter to from zeolites, provided electerical neutrality is maintained.