Hardness of water is due to soluble salts:

Bicarbonates

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Sulphates

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Chlorides

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All of these

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Solution

The correct option is B All of these
Hardness of water is due to soluble salts such as bicarbonates, sulfates an chlorides of magnesium and calcium.

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10. With reference to Hard water, which of the statements given is/are correct?

1. Hardness in water is caused by soluble salts of calcium and magnesium.

2. Hard water is known to reduce the efficiency of boilers.

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