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A sample of drinking water was found to be severely contaminated with chloroform ($CHCl_3$) supposed to be a carcinogen. The level of contamination was 15 ppm (by mass):(i) express this in percent by mass

1 Answer

$15\times 10^{-5}$%
Hence (A) is the correct answer
answered Jun 16, 2014 by sreemathi.v