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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 |
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Answer» The correct CHOICE is (d) 0-75ppm |
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