The hardness of water is caused by the presence of which of the following in water?

Calcium and Magnesium

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Chloride and Sulphates

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Sodium and Potassium

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Nitrites and Nitrates

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Solution

The correct option is A Calcium and Magnesium
Hardness is due to polyvalent metallic cations and is generally due to $C a^{2 +}$ and $M g^{2 +}$ ions.

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