Q.

Which statement about zeolite is false ?

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a

They are used as cation exchanger

b

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

c

Zeolites are alumino silicates having three dimensional networks

d

Some of the SiO44- units are replaced by AlO45-  and  AlO89- ions in zeolites

answer is D.

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Detailed Solution

1, 2 and 3 are characteristics of zeolites.If ‘Al’ atoms replace few silicon atoms in three dimensional network of  SiO2 over all structure known as alumino silicate (Zeolite)
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Which statement about zeolite is false ?