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Question

CO2 fire extinguishers can be used to effectively put off fires involving all the below substances except:


A
electrical appliances
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B
petrol
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C
wood
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D
plastic
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Solution

The correct options are
C wood
D plastic
  • Carbon dioxide fire extinguishers contain carbon dioxide in liquid form, and when the extinguisher is let off the liquid cuts off the oxygen supply.
  • They are mostly used to put off fires involving electrical appliances and inflammable liquids like petrol, diesel, etc.
  • They cannot be used for fires involving ordinary combustibles, such as wood, paper, cloth, trash and plastics because they may not be able to displace enough oxygen to successfully put the fire out.
  • Also, these materials can smoulder and regnite. Thus, usually water is used in these cases.

Chemistry

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