. Hard water required for an experiment is not available in a school laboratory


Hard water required for an experiment is not available  in a school laboratory. However, following salts are available  in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment.

 

1. Calcium Sulphate

 

2. Sodium Sulphate

 

3. Calcium Chloride

 

4. Potassium Sulphate

 

5. Sodium Hydrogen  Carbonate

 

6. Magnesium Chloride

 

(A) 1, 2 and 4

 

(B) 1, 3 and 6

 

(C) 3, 5 and 6

 

(D) 2, 4 and 5

Best Answer

B

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