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The oxide of Nitrogen used in medicine as anaesthetic is

  • A.Nitrogen dioxide
  • B.Nitric oxide
  • C.Nitrous oxide
  • D.Nitrogen pentoxide

Answer: C

Nitrous oxide (N2O) is the oxide of nitrogen used as an anaesthetic. Known as laughing gas, it has been used in dentistry and surgery since the 1840s.

Nitric oxide and nitrogen dioxide are toxic, and nitrogen pentoxide is an unstable solid that reacts violently with water - none of them could be breathed.

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