Question

Select the incorrect statement from the following option.

(a) Water which does not form lather with soap and forms white scum is called hard water

(b) Hard water contains dissolved calcium and magnesium salts in it

(c) In hard water, cleansing quality of soap is depressed

(d) Due to the presence of dissolved hardness-producing salts, the boiling point of water is depressed

The question was posed to me in an online quiz.

Enquiry is from Hardness of Water topic in division Water and its Treatment of Engineering Chemistry II

Answer 1

Right option is (d) Due to the presence of dissolved hardness-producing salts, the boiling point of water is depressed

Explanation: Due to the presence of dissolved hardness-producing salts, the boiling point of water is elevated. Elevation in boiling point is one of the most important colligative property. All the other options are correct.