If hardness of water sample is 200ppm, then select the incorrect statement:

Hardness of water sample is 300 ppm CaCO_3 Hence its molarity is:

Hardness of water sample is 300 ppm CaCO_3 Hence its molarity is:

Degree of hardness of a water sample is 100ppm. If that sample contains hardness causing salt Mg(HCO_3)_2 , calculate weight of Ca(OH)_2 required for the treatment of 10kg of water sample.

If hardness of water sample is 200 parts per million , Calculate the mass ratio of CaCO3 to water is:

Degree of hardness of a water sample is 100ppm. 50 ml of standard soap solution is added to one kilogram of hard water sample. Calculate the degree of hardness of the resulting water sample. (one ml of soap solution is 0.001 g CaCO_3 ).

A hard water sample contains dissolved Mg(HCO_3)_2 only. If degree of hardness of that sample is 150ppm, calculate the weight of Mg(HCO_3)_2 present in 1kg of water sample.

Hardness of a water sample is 150 ppm. Its hardness is due to only calcium bicarbonate, the weight of calcium hydroxide that required to remove hardness of one litre of hard water is

The degree of hardness of a given sample of hard water is 60 ppm. If the entire hardness is due to MgSO_4, how many of MgSO_4 is present per kilogram of hard water ?