Multiple choice

Which of the following is an inert gaseous non-metal whose presence in air reduces the rate of combustion?

  1. Nitrogen

  2. Oxygen

  3. Sulphur

  4. None of these

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A Correct answer
Explanation

Nitrogen makes up about 78 percent of the Earth's atmosphere and is relatively inert. Its presence dilutes oxygen, which prevents combustion from occurring too rapidly or uncontrollably.