Temporary hardness and permanent hardness in water can be removed respectively by the addition of
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a
CaO, CaCO3
b
CaO, Na2CO3
c
Na2CO3, CaO
d
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