A sample of water contains 1×10−3 moles of per 10 kg of water. Calculate the degree of hardness of water.
A
50 ppm
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B
500 ppm
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C
100 ppm
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D
10 ppm
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Solution
The correct option is D10 ppm 104 gms of water contain 10−3 moles 106 gms of water contain 10−3104×106 = 0.1 mole. 1 mole has degree of hardness =100 ppm 0.1 mole has degree of hardness =100×0.1=10 ppm