Q. A compound that imparts temporary hardness to water

A
Calcium sulphate
B
Magnesium chloride
C
Calcium nitrate
D
Magnesium bicarbonate
Solution:

Temporary hardness is due to the presence of calcium bicarbonate Ca(HCO3)2 and magnesium bicarbonate Mg(HCO3)2. Both calciumbicarbonate and magnesium bicarbonate decompose when heated. The original insoluble carbonate is reformed. This happens when water is boiled

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