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Question

Hardness of water is expressed in terms of parts per million of calcium carbonate. A sample of water contains 0.02% of calcium carbonate, hardness of the sample is


Solution

The correct option is A
Mass of CaCO3=0.02g
Mass of solution = 100g
concentration in ppm = mass of solutemass of solution×106=0.02100×106=200ppm

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