Which gas is released when chlorine free radicals react with ozone?

What is the percentage contribution of $CO$ to the total atmospheric concentration due to forest fires?

Which of the given statements are correct, when carboxyhaemoglobin reaches $3-4 \%$ in blood?
$(I)$ Leads to headache
$(II)$ Results in cardiovascular problems
$(III)$ Increases the body temperature
$(IV)$ Leads to diarrhoea

The decomposition of organic compounds in the presence of oxygen and without the formation of odoriferous substances is called:

The concentration of dissolved oxygen in water for the growth of fish should be more than $X \ ppm$ and the Biochemical Oxygen Demand $(BOD)$ in clean water should be less than $Y \ ppm$. $X$ and $Y$ in $ppm$ are,respectively:

Which gas among the following has the maximum global warming potential?