Hardness of water is measured in terms of ppm CaCO_(3). It is the amount in gms of CaCO_(3) present in 10^(6) gms of H_(2)O.In a sample of 10 litre water,0.56 gm of CaO is required to remove temporary hardness of HCO_(3)^(-). Permanent hardness due to SO_(4)^(2-) and Cl^(-)of C^(2+) andMg^(2+) and is removed y the addition of Na_(2)CO_(3). Temperature hardness is due to HCO_(3)^(-) of Ca^(2+) and Mg^(2+). It is removed by the addition of CaO. Ca(HCO_(3))_(2)+CaOrarr2CaCO_(3)+H_(2)O massof CaO required to precipitate 2 gm of CaCO_(3) is

Hardness of water is measured in terms of ppm CaCO_(3). It is the amou

1.	Hardness of water is measured in terms of ppm CaCO_(3). It is the amount in gms of CaCO_(3) present in 10^(6) gms of H_(2)O.In a sample of 10 litre water,0.56 gm of CaO is required to remove temporary hardness of HCO_(3)^(-). Permanent hardness due to SO_(4)^(2-) and Cl^(-)of C^(2+) andMg^(2+) and is removed y the addition of Na_(2)CO_(3). Temperature hardness is due to HCO_(3)^(-) of Ca^(2+) and Mg^(2+). It is removed by the addition of CaO. Ca(HCO_(3))_(2)+CaOrarr2CaCO_(3)+H_(2)O massof CaO required to precipitate 2 gm of CaCO_(3) is
Answer» 2.00 gm 0.56 gm 0.28 gm 1.12 gm Answer :B