Temporary hardness and permanent hardness in water can be removed respectively by the addition of

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CaO, CaCO3

CaO, Na2CO3

Na2CO3, CaO

NaHCO3, CaCl2

answer is B.

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Detailed Solution

Temporary hardness is due to dissolved HCO3- of Ca2+ and Mg2+CaHCO32+CaO⟶2CaCO3+H2OPermanent hardness is due to dissolved Cl−and SO42− of Ca2+and Mg2+CaCl2+Na2CO3⟶CaCO3↓+2NaCl CaSO4+Na2CO3⟶CaCO3↓+Na2SO4

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