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Chemistry · Some Basic Concepts of Chemistry
हिन्दीA sample of drinking water was found to be severely contaminated with chloroform, \( \text{CHCl}_3 \), supposed to be carcinogenic in nature. The level of contamination was \( 15\text{ ppm} \) (by mass). Express this in per cent by mass.
Correct answer · Option 4
\( 1.5 \times 10^{-3}\% \)
Explanation
\( 15\text{ ppm} = \frac{15}{10^6} \times 100\% = 1.5 \times 10^{-3}\% \).
