Unstable hardness of water is due to the presence of:

C a C l_{2}, M g S O_{4}

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C a^{+ 2}, M g^{+ 2}

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K^{+}, C a C O_{3}

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C a (H C O_{3})_{2}, M g (H C O_{3})_{2}

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Solution

The correct option is D $C a (H C O_{3})_{2}, M g (H C O_{3})_{2}$
Hard water, water that contains salts of calcium and magnesium principally as bicarbonates, chlorides, and sulfates. Water hardness that is caused by calcium bicarbonate is known as temporary, because boiling converts the bicarbonate to the insoluble carbonate; hardness from the other salts is called permanent.

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