A. CaCO3
B. Na2CO3
C. Na2SO4
D. CaSO4
Correct Answer:
Option A – CaCO3
Explanation
Permanent hardness in water= Mg and Ca Sulphate.
Temporary hardness in water= Mg and Ca Carbonate.
Temporary hardness of water is caused by Magnesium and calcium hydrogencarbonate. It is formed when rainwater containing dissolved CO2 flows over a deposit of CaCO3
i.e CaCO3 + CO2 + H2O → Ca(HCO3)2
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