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Which of the following gases is the most toxic?

  • A.Ammonia
  • B.Carbon dioxide
  • C.Sulphur dioxide
  • D.Carbon monoxide

Answer: D

Carbon monoxide is the most toxic of these.

It binds to haemoglobin about 240 times more strongly than oxygen does, forming carboxyhaemoglobin, so the blood can no longer carry oxygen. A few hundred parts per million can be fatal, and because the gas is colourless and odourless there is no warning.

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