Different water samples A, B, C and D have 150 ppm each of $C a C l_{2}, M g S O_{4}, C a S O_{4} a n d M g C l_{2}$ respectively. The order of degree of hardness of these samples is

D > A > B > C

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A > B > C > D

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C > B > A > D

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C > A > D > B

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Solution

The correct option is A D > A > B > C
$H a r d n e s s \propto \frac{1}{m o l a r m a s s}$

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$H a r d n e s s \propto \frac{1}{m o l a r m a s s}$