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Question

Different water samples A, B, C and D have 150 ppm each of CaCl2,MgSO4,CaSO4 and MgCl2 respectively. The order of degree of hardness of these samples is

A
D > A > B > C
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B
A > B > C > D
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C
C > B > A > D
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D
C > A > D > B
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