Which one of the following statements about t | vedclass

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(B) Zeolites are aluminosilicates with a three-dimensional network structure. In this structure,some $SiO_4$ units are replaced by $AlO_4$ tetrahedra.

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Some of the $SiO_4^{4-}$ units are replaced by $AlO_4^{5-}$ and $AlO_6^{9-}$ ions in zeolites

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(B) Zeolites are aluminosilicates with a three-dimensional network structure. In this structure,some $SiO_4$ units are replaced by $AlO_4$ tetrahedra. They do not contain $AlO_6$ units. Therefore,the statement that $SiO_4^{4-}$ units are replaced by $AlO_4^{5-}$ and $AlO_6^{9-}$ ions is false. Zeolites possess an open,cage-like structure that allows them to act as cation exchangers and adsorb small molecules.

Which one of the following statements about the zeolites is false?

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