Exhausted permutit is

${N a}_{2}$ ${A l}_{2}$ ${S i}_{2}$ $O_{8}$ .x $H_{2}$ O

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${C a A l}_{2}$ ${S i}_{2}$ $O_{8}$ .x $H_{2}$ O

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$K_{2}$ ${A l}_{2}$ ${S i}_{2}$ $O_{8}$ .x $H_{2}$ O

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${C a B}_{2}$ ${S i}_{2}$ $O_{8}$ .x $H_{2}$ O

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Solution

The correct option is B
${C a A l}_{2}$ ${S i}_{2}$ $O_{8}$ .x $H_{2}$ O

In exhausted permutit all sodium ions are replaced by Calcium or Magnesium ions

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