CBSE Class 10 Science 2017 · Paper 31(B)/C · Question 27
Select a group from the following groups of salt, each salt of which on dissolving in distilled water can make it hard :
- (a)Sodium chloride ; Calcium chloride
- (b)Sodium chloride ; Potassium chloride
- (c)Calcium chloride ; Magnesium chloride
- (d)Magnesium chloride ; Potassium chloride
Answer
(c) Calcium chloride ; Magnesium chloride
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