The formula for permutit or zeolite which is used as softer in ion-exchange method is:

N a A l S i O_{4}

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N a A l O_{2}

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both

A

and

B

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N a_{2} S O_{4}

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Solution

The correct option is C $N a A l S i O_{4}$
Permutit is an artificial zeolite. It is sodium aluminium orthosilicate $N a_{2} A l_{2} S i_{2} O_{8} . x H_{2} O$ .
$N a_{2} A l_{2} S i_{2} O_{8} . x H_{2} O permutit + C a^{2 +} (o r M g^{2 +}) \to C a A l_{2} S i_{2} O_{8} . x H_{2} O exhausted permutit + 2 N a^{+}$

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