Question : The metallic contituents of hard water are:
Option 1: Magnesium calcium and tin
Option 2: Iron ,tin and calcium
Option 3: Calcium ,magnesium and iron
Option 4: Magnesium ,tin and iron
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Correct Answer: Calcium ,magnesium and iron
Solution : Correct Answer is calcium and magnesium ions
Water hardness is caused by calcium and magnesium ions, and the anions are thus chlorides and sulphates.
The two most prevalent minerals that make water "hard" are dissolved calcium and magnesium. As the calcium and magnesium level increases, so does the degree of hardness.Calcium hydroxide Ca(OH)2 is the chemical formula for hard water.
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