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If 1 kg of water contains 12 mg of magne...

If 1 kg of water contains 12 mg of magnesium sulphate its degree of hardness is

A

50 ppm

B

60 ppm

C

12 ppm

D

10 ppm

Text Solution

Verified by Experts

The correct Answer is:
D
13 mg `MgSO_4 rArr 12 xx 10^(-3) gm " of " MgSO_4`
`MgSO_4` hardness `=(12 xx 10^(-3)g)/(10^3g) xx 10^6 =12` ppm
`rArr 12g " of " MgSO_4" in " 10^6 g` of water
hardness in terms of
`CaCO_3 = 12 xx100/12 = 10`ppm
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