Which one of the following statements about zeolite is false ?

They are used as cation exchanger

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

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Zcolitcs are aluminosilicates having a three dimensional network.

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Sonic of the

S i O_{4}^{4 -}

units arc replaced by

A l O_{4}^{5 -}

and

A L o_{6}^{9 -}

ions in zeolites

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Solution

The correct option is D Sonic of the $S i O_{4}^{4 -}$ units arc replaced by $A l O_{4}^{5 -}$ and $A L o_{6}^{9 -}$ ions in zeolites
The statement (D) about zeolites is false.
The general formula of zeolites is
$M_{x}^{n +} [(A l O_{2})_{x} (S i O_{2})_{y}]_{n}^{x} \cdot z H_{2} O$

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