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Question

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


A

Calcium and Magnesium nitrites

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B

Calcium and Magnesium Nitrate

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C

Calcium and Magnesium carbonates

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D

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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