Question

Select the incorrect statement from the following option.

(a) The taste of hard water is better than soft water

(b) The dissolved calcium in hard water can help to produce strong teeth

(c) Hard water coats the lead piping with a layer of insoluble calcium carbonate which prevents poisonous lead dissolving in water

(d) Boiler feed water should also be hard in nature

The question was asked in a national level competition.

This interesting question is from Hardness of Water topic in portion Water and its Treatment of Engineering Chemistry II

Answer 1

Correct answer is (d) Boiler feed water should also be hard in nature

For explanation I would say: Boiler feed water should be free from hardness otherwise explosion may occur. All the other options are correct. The taste of hard water is better than soft water and dissolved calcium in hard water can help to produce strong teeth. Hard water coats the lead piping with a layer of insoluble calcium carbonate which prevents poisonous lead dissolving in water.