Q.

The metallic constituents of hard water are -

A. Magnesium, Calcium and tin
B. Iron, tin and calcium
C. Calcium, magnesium and iron
D. Magnesium, tin and iron
Answer» C. Calcium, magnesium and iron
Explanation: Hard water is water that has high mineral content (in contrast with "soft water"). Hard water is formed whenwater percolates through deposits of limestone and chalk which are largely made up of calcium and magnesium carbonates.
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