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Hardness of Water and Treatment

The temporary...

Question

The temporary hardness of water is due to:

 JEE MAIN 2019

A

C a (H C O_{3})_{2}

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B

N a C l

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C

C a C l_{2}

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D

N a_{2} S O_{4}

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Solution

The correct option is A $C a (H C O_{3})_{2}$
Permanent hardness is due to the presence of dissolved chlorides and sulphates of Calcium, Magnesium, Iron, and other heavy elements.
Temporary hardness is caused by bicarbonates of Calcium and Magnesium.
Thus, $C a (H C O_{3})_{2}$ and $M g (H C O_{3})_{2}$ is responsible for temporary hardness of water.

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