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15/05/2026
13/05/2026

A sample of drinking water was found to be severely contaminated with chloroform, CHCl3, supposed to be carcinogenic in nature. The level of contamination was 15 ppm (by mass).

(i) Express this in percent by mass.

(ii) Determine the molality of chloroform in the water sample.

29/04/2026
21/04/2026

why non-metal show variable valency

17/04/2026

question answer practise mole concept for 11,p1

10/04/2026

Difference between eg and electronegativity

09/04/2026

The easiest way to remember atomic masses for the first 20 elements

05/04/2026

Electronic configuration for class 8 and 9

Class 12,
05/04/2026

Class 12,

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