Temporary hard water is formed when rain water containing...
Temporary hard water is formed when rain water containing dissolved carbon(IV) oxide flows over deposits of
CaCO3
Na2CO3
Na2SO4
CaSO4
Correct answer is A
Permanent hardness in water= Mg & Ca Sulphate.
Temporary hardness in water= Mg & Ca Carbonate.
Temporary hardness of water is caused by Magnesium and calcium hydrogencarbonate. It is formed when rainwater containing dissolved CO2 flows over deposit of CaCO3
i.e CaCO3 + CO2 + H2O → Ca(HCO3)2
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