Which of the following will cause the temporary hardness of water?

NaCl

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Ca(HCO₃)₂

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MgSO₄

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Na₂SO₄

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Solution

The correct option is B
Ca(HCO₃)₂

Explanation for the correct option
Temporary hardness of water is caused by the presence of the following salts in water-
Calcium bicarbonate Ca(HCO₃)₂
Magnesium bicarbonate Mg(HCO₃)₂
Explanation for the incorrect options
Magnesium Sulphate (MgSO₄₎ is responsible for the permanent hardness of water
Sodium chloride (NaCl) is not responsible for either the temporary or permanent hardness of the water.
Sodium sulfate (Na₂SO₄) is not responsible for either the temporary or permanent hardness of the water.
Hence, option (b) is the correct option. Temporary hardness of water is caused by Calcium bicarbonate Ca(HCO₃)₂

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Sulphates and chlorides of magnesium and calcium cause temporary hardness of water.

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