Which of the following statement about zeolite is false?

They are used as cation exchangers

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They have open structure which enables them to take up small molecules

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Zeolites are aluminosilicates having three dimensional network

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Some of the

S i O_{4}^{4 -}

units are repalced by

A l O_{4}^{5 -}

and

A l O_{6}^{9 -}

^- ions in zeolite

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Solution

The correct option is D Some of the $S i O_{4}^{4 -}$ units are repalced by $A l O_{4}^{5 -}$ and $A l O_{6}^{9 -}$ ^- ions in zeolite
$A l O_{4}^{5 -}$ ion has nearly the same size as the $S i O_{4}^{4 -}$ ion and can replace the latter from silicates provided electrical neutrality is maintained.

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