The compound which when dissolved in water makes the water hard is:
calcium carbonate
calcium bicarbonate
sodium chloride
barium sulphate
A
calcium carbonate
B
barium sulphate
C
sodium chloride
D
calcium bicarbonate
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Solution
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The compound which when dissolved in water makes the water hard is calcium bicarbonate. The hardness of water is due to the presence of bicarbonates, sulphates and chlorides of calcium and magnesium.
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