According to World Health Organization, the soft water has 0 to _________ milligram per litre as CaCO₃.

Correct option is B

The correct answer is (b) 60.
· According to the World Health Organization (WHO), soft water has a hardness level of 0 to 60 milligrams per liter of calcium carbonate (CaCO₃).
· Water hardness is primarily determined by the concentration of calcium and magnesium ions, with soft water containing lower amounts of these minerals.
Information Booster:
· Soft water is generally preferred for household uses, as it reduces scaling in pipes and makes cleaning more efficient.
· Hard water, which contains higher concentrations of minerals, can cause limescale buildup and reduce the effectiveness of soaps and detergents.