CBSE Class 10 Science 2015 Term II Delhi Set 1

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Question : 27
Total: 36
Hard water is not available for an experiment. Some salts are given below :
(I) Sodium chloride
(II) Sodium sulphate
(III) Calcium chloride
(IV) Calcium sulphate
(V) Potassium chloride
(VI) Magnesium sulphate
Select from the following a group of these salts, each member of which may be dissolved in water to make it hard.
Solution:  
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