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If people sleep in closed rooms where charcoal fire is burning, they die due to

  • A.Carbon monoxide
  • B.Carbon dioxide
  • C.Methane
  • D.Phosgene

Answer: A

They die of carbon monoxide poisoning.

Charcoal burning in a poorly ventilated room has too little oxygen for complete combustion, so it forms CO. Carbon monoxide binds to haemoglobin about 240 times more strongly than oxygen does, forming carboxyhaemoglobin and starving the tissues of oxygen. It is colourless and odourless, so there is no warning.

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