Question

student requires hard water for an experiment in his laboratory which

is not available in the neighbouring area. In the laboratory there are

some salts, which when dissolved in distilled water can convert it into

hard water. Select from the following groups of salts, a group, each salt

of which when dissolved in distilled water will make it hard.

(A) Sodium chloride, Potassium chloride

(B) Sodium sulphate, Potassium sulphate

(C) Sodium sulphate, Calcium sulphate

(D) Calcium sulphate, Calcium chloride​

Answer 1

Answer:

d)

Explanation:

Answer 2

Answer:

d - calcium sulphate, calcium chloride

Explanation:

Salts of calcium and magnesium makes water hard. Hard water does not form lather with soaps easily.