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(D) $1$. Calgon's method uses sodium hexametaphosphate $(Na_6P_6O_{18})$,which is commercially called 'Calgon'. It keeps calcium and magne

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All of these.

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(D) $1$. Calgon's method uses sodium hexametaphosphate $(Na_6P_6O_{18})$,which is commercially called 'Calgon'. It keeps calcium and magnesium ions in solution as complex ions.
$2$. The permutit method uses hydrated sodium aluminium silicate $(Na_2Al_2Si_2O_8 \cdot xH_2O)$,also known as zeolite,to exchange $Na^{+}$ ions with $Ca^{2+}$ and $Mg^{2+}$ ions.
$3$. The synthetic resin method uses ion-exchange resins to remove all soluble mineral salts (both cations and anions) from water,resulting in demineralized or deionized water.
$4$. Since all the given statements are correct,the correct option is $D$.

Choose the correct statement about various water softening methods.

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