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Q.

Which one of the following statements about a zeolite is false

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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

answer is D.

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Detailed 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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