NEET2004Chemistryp Block Elements (Group 13 & 14)Actual
Which one of the following statements about the zeolite is false?
Options
- AThey are used as cation exchangers
- BThey have open structure which enables them to take up small molecules
- CZeolites are aluminosilicates having three dimensional network
- DSome at the SiO ₄⁴⁻ units are replaced by AlO ₄⁵⁻ and AlO ₆⁹⁻ ions in zeolites
Correct answer
D. Some at the SiO ₄⁴⁻ units are replaced by AlO ₄⁵⁻ and AlO ₆⁹⁻ ions in zeolites
Step-by-step 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 a