Question

$14.2$ g ${Na}_{2}S{O}_4$ is present in ${10}^2$ kg water. Its concentration in ppm is:

• A. $10$ ppm
• B. $100$ ppm
• C. $142$ ppm
• D. $14.2$ ppm

Answer 1

The correct option is C $142$ ppm

$14.2$ g ${Na}_{2}S{O}_4$ is present in ${10}^2$ kg water.

So, $N{a}_{2}S{O}_4$ present in ${10}^6$ g is $14.2\times 10=142$ ppm