Q. Which of the following can be used as fire extinguishing agents?

1. Carbon dioxide
2. Sodium bicarbonate
3. Potassium nitrate
4. Phosphorus pentoxide

Select the correct option from the codes given below:
Answer: Only 1 & 2
Notes: Carbon dioxide displaces oxygen and cools flames, and sodium bicarbonate releases CO₂ upon heating, making both effective as fire extinguishing agents. Potassium nitrate is an oxidizer used in making gunpowder and promotes combustion. Phosphorus pentoxide acts primarily as a desiccant, not as a fire suppressant. Thus, only options 1 and 2 are correct.