Which one of the following statements about a zeolite is false

Easy

A

They have cage like structure which enables them to take up small molecules
B

They are used as cation exchangers
C

Zeolites are alumino silicates having three dimensional network
D

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

Solution

$\large \mathop {N{a_2}A{l_2}S{i_2}{O_8}.x{H_2}O}\limits_{\begin{array}{*{20}{c}} {sodium\;zeolite\;(or)} \\ {N{a_2}O.A{l_2}{O_3}.2Si{O_2}.x{H_2}O} \end{array}} + \mathop {C{a^{ + 2}}}\limits_{(Hardwater)} \to \mathop {CaA{l_2}S{i_2}{O_8}.x{H_2}O}\limits_{Exhausted\;zeolite} + 2N{a^ + }\$
→ Zeolite have cage like structure. Those cages helps to remove small molecules like H₂O.
→ They removes the cations [Ca⁺² & Mg⁺²] which causes hardness to the hardwater i.e., They are used as cation exchangers.
→ Zeolite are aluminium silicates having three dimensional network structure.
→ Zeolite are formed by the replacement of Si⁺⁴ ions by Al⁺³ ions.

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