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Q.

The temporary hardness of water is due to the presence of

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a

soluble salts of magnesium or/and calcium other than bicarbonates

b

bicarbonates of calcium or/and magnesium

c

soluble salts of alkali metals

d

dissolved carbon dioxide

answer is B.

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Detailed Solution

Explanation:

Temporary hardness of water is caused by the presence of bicarbonates of calcium (Ca(HCO₃)₂) and magnesium (Mg(HCO₃)₂). These bicarbonates decompose upon boiling, releasing carbon dioxide and precipitating as insoluble carbonates, which can be removed. This is why it is called "temporary" hardness, as it can be eliminated by boiling the water.

The correct answer is bicarbonates of calcium or/and magnesium.

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