state gov Bihar Police Constable (सिपाही) Mock Test Series 2025 General Science Biology Ecology & Environment
Which of the following statements is correct about the ozone?
1
Decrease in the amount of ozone in the atmosphere is due to chlorofluorocarbons (CFC).
2
It is not poisonous.
3
It is formed by combining only two atoms of oxygen.
4
It causes blood cancer.