Calculate the mass of CaO required to remove the hardness of `10^(6)` litre of water containing `1.62 g` of calcium bicarbonate per litre.

Options

A. `5.6xx10^(4)g`
B. `5.6xx10^(5)g`
C. `5.6xx10^(6) g`
D. `5.6xx10^(3) g`

Answer

C

Explanation

The reaction,
`CaO+Ca(HCO_3)_(2) to 2CaCO_(3)+H_(2)O" ":. Eq." of "Ca(HCO_3)_(2)` present in hard water (1 litre)
`(1.62)/(162"/"2)=0.02" ":.` Eq. of CaO required to remove `Ca(HCO_3)_(2)` in 1 litre `=0.02`
Eq. of `CaO` required to remove `Ca(HCO_3)_(2)` in `10^(6)` litre `=0.02xx10^6`
Mass of `CaO =0.02xx10^(6)xx(56)/(2) g =5.6xx10^(5) g`