Match the pollutant is List I with its maximum permissible limit in drinking water given in List II
| List I | List II | ||
|---|---|---|---|
| A | Lead | I | 500 ppm |
| B | Sulphate | II | 50 ppm |
| C | Nitrate | III | 50 ppb |
Which of the following is/are estimated by tura polluted water with potassium dichromate solution in acidic medium?
$$ \begin{array}{c|c|c} \hline \text { COD } & \text { BOD } & \text { DO } \\ \hline \text { I } & \text { II } & \text { III } \\ \hline \end{array} $$
$$ \text { Match the following. } $$
| List-I F-ion concentration in drinking water) |
List-II (Effects on humans) |
||
|---|---|---|---|
| A | $$ \text { <1 ppm } $$ |
I | $$ \text { Harmful to bones } $$ |
| B | $$ >2 \mathrm{ppm} $$ |
II | $$ \text { Tooth decay } $$ |
| C | $$ >10 \mathrm{ppm} $$ |
III | $$ \text { Brown mottling of teeth } $$ |
Arrange the following pestidides in the chronological order of their release into the market.
Organophosphates Organochlorides Sodium chlorate
$\quad \text { (A) } \quad\quad\quad\quad\quad\quad\quad \text { (B) } \quad\quad\quad\quad \text { (C) }$
Which among the following is not a greenhouse gas?
Which among the following has the highest concentration of PAN?
Green chemistry refers to reactions which