Environment Studies (Science) (M.Phil./Ph.D.) 2022 Panjab University Entrance Exam With Answers

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37.

Which of the following salts is the main cause of permanent hardness of water?

A: Magnesium Phosphate
B: Magnesium Oxalate
C: Magnesium Sulphate
D: Magnesium Carbonate

The answer is: C