Q59 / 200 · NEET 2004 · Chemistry

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

  • A
    They are used as cation exchangers
  • B
    They have open structure which enables them to take up small molecules
  • C
    Zeolites are aluminosilicates having three dimensional network
  • Correct answer
    D
    Some at the $\mathrm{SiO}_4^{4-}$ units are replaced by $\mathrm{AlO}_4^{5-}$ and $\mathrm{AlO}_6^{9-}$ ions in zeolites

Solution

The zeolites are noted for their ability towards ion-exchange and reversible dehydration. They have a framework structure that encloses interconnected cavities occupied by large metal cations (positively charged ions) and water molecules. Related Theory Zeolite are hydrated aluminosilicate minerals that contain alkali and alkaline-earth metals. They have a honeycomb-like structure, which makes them shape-selective catalysts. They have an extended 3D-network of silicates in which some silicon atoms are replaced by aluminium atoms giving Al-O-Si framework.

Hence, the correct answer is option: 'D'.

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