Question

In a locality, hard water required for an experiment is not available. However the following salts are available in the school lab.

1. sodium sulphate,

2. calcium sulphate

3. magnesium chloride.

4. sodium chloride

5. Calcium chloride.

6. pottasium sulphate.

Which of the following salts may be dissolved in water to obtain hard water.

A) 2 3 5

B) 1 2 5

C) 1 2 4 and 6

D) 3 5

Answer 1

Option a is correct