Civil Engineering MCQ DUASO Hard water is water, which contains soluble salts of which of the following elements?

Hard water is water, which contains soluble salts of which of the following elements?

Naim 10:12 DUASO

Hard water is water, which contains soluble salts of which of the following elements?

A. Sodium
B. Sulfur
C. Calcium
D. Chlorine

Answer: C

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