Which of the following statements about zeolites is incorrect?
- AThey are used as cation exchangers.
- BThey have a structure that can accommodate small molecules.
- CZeolites are aluminosilicates that have a three-dimensional network structure.
- DIn zeolites,no $SiO_4^{4-}$ units are replaced by $AlO_4^{5-}$ and $AlO_6^{9-}$ ions.
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