First slide

Hardness of water

Question

Which statement about zeolite is false ?

Moderate

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 ${SiO}_{4}^{4 -}$ units are replaced by ${AlO}_{4}^{5 -} and {AlO}_{8}^{9 -}$ ions in zeolites

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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