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 domestic settings, hard water is often indicated by a lack of suds formation when soap is agitated in water. Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects.
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