Q. Which of the following statements are correct about zeolite?
Zeolites are aluminosilicates having three dimensional network
Shape selectivity of zeolites depends upon porous structures of the catalyst
Zeolites are synthetic microporous aluminosilicates which do not exist naturally
Zeolites are open structures of silica in which trivalent aluminium substitute by a fraction of silicon atoms

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Solution:

Zeolites are naturally occurring or synthetic microporous aluminosilicates which are used to remove permanent hardness from hard water. Shape selectivity of zeolites depends upon porous structures of the catalyst.