Question

Which gas is used in fire extinguisher?

• A. Oxygen
• B. Nitrogen
• C. Carbon dioxide
• D. Sulphur dioxide

Answer 1

The correct option is C

Carbon dioxide

Explanation for the correct answer-

Option (C) Carbon dioxide gas $\left({\mathrm{CO}}_2\right)$

1. It is heavier than oxygen.
2. When there is a fire it works like a blanket between oxygen and fire.
3. Using a fire extinguisher Carbon dioxide [CO₂] gas is supplied which cut off Oxygen [O₂].

Explanation for incorrect answer

Option (A) Oxygen $\left({\mathrm{O}}_2\right)$

1. Oxygen supports combustion.
2. It is colourless, odourless, and tasteless.
3. It is used as fuel.

Option (B) Nitrogen $\left({\mathrm{N}}_2\right)$

1. Nitrogen is important to the chemical industry.
2. It is used to make fertilizers, nitric acid, nylon, dyes and explosives.
3. It is used in stainless steel manufacturing.

Option (D) Sulphur dioxide $\left({\mathrm{SO}}_2\right)$

1. Sulphur dioxide appears as a colourless gas with a choking or suffocating odour.
2. It dissolves in water very easily.
3. It is used to production of sulphuric acid, paper, and food preservatives.

Therefore, option (C) carbon dioxide is the correct answer.