Exhausted permutit is

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(C) Hydrated sodium aluminium silicate $(Na_2 Al_2 Si_2 O_8 \cdot x H_2 O)$ is known as permutit or zeolite.During the water softening process,the $Na

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$Ca Al_2 Si_2 O_8 \cdot x H_2 O$

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(C) Hydrated sodium aluminium silicate $(Na_2 Al_2 Si_2 O_8 \cdot x H_2 O)$ is known as permutit or zeolite.During the water softening process,the $Na^+$ ions in the permutit are replaced by $Ca^{2+}$ or $Mg^{2+}$ ions present in the hard water.When all the $Na^+$ ions are replaced by $Ca^{2+}$ or $Mg^{2+}$ ions,the permutit is said to be exhausted.Therefore,exhausted permutit is $Ca Al_2 Si_2 O_8 \cdot x H_2 O$ (or the corresponding magnesium salt).

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