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Hardness of water is measured in terms o...

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+)` and`Mg^(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

A

2.00 gm

B

0.56 gm

C

0.28 gm

D

1.12 gm

Text Solution

Verified by Experts

The correct Answer is:
B
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