A) Zeolites are aluminosilicates having three dimensional network
B) Some of the \[SiO_{4}^{-4}\]units are replaced by \[AlO_{4}^{-5}\] and \[AlO_{6}^{9-}\] ions in zeolites
C) They are used as cation exchangers
D) They have open structure which enables them to take up small molecules
Correct Answer: B
Solution :
Zeolite have \[Si{{O}_{4}}\] and \[Al{{O}_{4}}\] tetrahedrons linked together in a three dimensional open structure in which four or six membered ring predominate. Due to open chain structure they have cavities and can take up water and other small molecules.
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