Question

A Student requires hard water for an experiment in his laboratory whien
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 ot
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:

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Answer 2

Answer:

b no.

Explanation:

sodium sulphate pottasium sulphate make it hard