Permanent hardness of water is due to the presence of ___________.

Sulphates of sodium and potassium

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Sulphate of magnesium and calcium

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Carbonates of sodium and magnesium

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Biocarbonates of magnesium and calcium

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Solution

The correct option is C Sulphate of magnesium and calcium
Permanent hardness in water is due to the presence of the chlorides, nitrates and sulphates of calcium and magnesium. It is not precipitated by boiling. These minerals in water can cause some everyday problems. Hard water may also shorten the life of plumbing and water heaters. The lime scale can build up on the inside of the pipe restricting the flow of water or causing a blockage.

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Similar questions

Q. Permanent hardness is due to the presence of soluble salts of magnesium and calcium in the form of chlorides and sulphates in water. Permanent hardness of water can be removed by:

Permanent hardness is caused by the dissolved __(sulphates/bicarbonates) of calcium and magnesium.

Q. Permanent hardness of water is due to the presence of chlorides and salts of calcium and magnesium. It can be removed by using .

Assertion (A): Permanent hardness of water is removed by treatment with washing soda.
Reason(R): Washing soda reacts with soluble magnesium and calcium sulphate to form water-soluble compounds.

Q. Assertion (A): Permanent hardness of water is removed by treatment with washing soda.
Reason(R): Washing soda reacts with soluble magnesium and calcium sulphate to form insoluble compounds.

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