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The soft water contains the hardness of about ____________(a) 0-45ppm(b) 0-55ppm(c) 0-65ppm(d) 0-75ppmThe question was posed to me during an online interview.I'd like to ask this question from Estimation of Hardness topic in section Water of Applied Chemistry

Answer»

The correct CHOICE is (d) 0-75ppm

Best explanation: The soft water contains the hardness of about 0-75ppm. The hardness of water is mainly due to the salts of CALCIUM and MAGNESIUM.



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