Hardness of water may be temporary or permanent. Permanent hardness is due to the presence of:

Chlorides of Ca and Mg in water

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Sulphates of Ca and Mg in water

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Hydrogen carbonates of Ca and Mg in water

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Carbonates of alkali metals in water

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Solution

The correct option is B Sulphates of Ca and Mg in water
The permanent hardness is due to the presence of chlorides
and sulphates of magnesium and calcium.

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What causes the temporary and permanent hardness of water?

C a (O H)_{2}

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