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Chemistry
The degree of hardness of water is usually expressed in terms of
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Q. The degree of hardness of water is usually expressed in terms of
AMU
AMU 2010
Hydrogen
A
ppm by weight of $MgSO_{4}$
100%
B
$g/L$ of $CaCO_{3}$ and $MgSO_{3}$ present
0%
C
$ppm$ by weight of $CaCO_{3}$ irrespective of whether it is actually present
0%
D
$ppm$ of $CaCO_{3}$ actually present in water
0%
Solution:
Degree of hardness of water is measured in terms of ppm by weight of $CaCO_{3}$ irrespective of whether it is actually present or not.