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Air pollution, its effects and cures - class-VIII

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Multiple Choice

Carbon monoxide is naturally produced by oxidation of   X  , a gas present in swamp area while it can be produced by   Y     of fuels containing carbon.

  1. X - $CO _{2}$, Y = complete combustion
  2. X - $CH _{4}$, Y = incomplete combustion
  3. X = C, Y = oxidation
  4. X = $CH _{4}$, Y = complete combustion
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