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Q: Hardness of water is caused by the presence of the following in water:
  • A. Chlorides and sulphates
  • B. Calcium and magnesium
  • C. Nitrites and nitrates
  • D. Sodium and potassium
Correct Answer: Option B - Hardness of water is due to presence of calcium and magnesium salts. Calcium hydroxide is clark's reagent it remove the hardness of water by converting bicarbonates into carbonate.
B. Hardness of water is due to presence of calcium and magnesium salts. Calcium hydroxide is clark's reagent it remove the hardness of water by converting bicarbonates into carbonate.

Explanations:

Hardness of water is due to presence of calcium and magnesium salts. Calcium hydroxide is clark's reagent it remove the hardness of water by converting bicarbonates into carbonate.