Four different water samples A, B, C and D each contains150 ppm of ${C a C l}_{2}$ , ${M g S O}_{4}$ , ${C a S O}_{4}$ , and ${M g C l}_{2}$ respectively.Choose the correct order of degree of hardness of these samples.

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

Lower the molecular weight, greater the degree of hardness

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