Which of the following is responsible for hardness of water?

C a H C O_{3}

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C a C l_{2}

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Both (a) and (b)

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None of these

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Solution

The correct option is C Both (a) and (b)
Temporary hardness of water is due to the presence of bicarbonates of calcium and magnesium while permanent hardness is due to the presence of soluble chlorides and sulphates of calcium and magnesium.

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Which of the following salt is responsible for the temporary hardness of water?

C a C l_{2}

M g C l_{2}

C a C O_{3}

10^{6}

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