Which of the following salts when dissolved in water produce hard water?

Calcium and Magnesium nitrites

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Calcium and Magnesium Nitrate

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Calcium and Magnesium carbonates

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All salts of Calcium and Magnesium

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Solution

The correct option is C
Calcium and Magnesium carbonates

Sulphates, Carbonates and Bicarbonates of calcium and magnesium are responsible for water becoming hard.

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Carbon dioxide, dissolved in water, can dissolve rocks containing calcium carbonate and magnesium carbonate. What are the respective salts formed?

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