Question

Which of the following statement about 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
• D. Some of the $Si{O}_4^{4-}$ units are repalced by $Al{O}_4^{5-}$ and $Al{O}_6^{9-}$^- ions in zeolite

Answer 1

The correct option is D Some of the $Si{O}_4^{4-}$ units are repalced by $Al{O}_4^{5-}$ and $Al{O}_6^{9-}$^- ions in zeolite

$Al{O}_4^{5-}$ ion has nearly the same size as the $Si{O}_4^{4-}$ ion and can replace the latter from silicates provided electrical neutrality is maintained.