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Hard water is not available for an exper...

Hard water is not available for an experiment. Some salts are given below:
Sodium chloride, sodium sulphate, calcium chloride, Calcium sulphate, Potassium chloride, Magnesium sulphate
Select the following a group of these salts, each member of which may be dissolved in water to make it hard.

A

I,ii,v

B

I,iii,v

C

iii,iv and vi

D

ii,iv,vi

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