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      Question

      Which gas is usually filled in electric bulbs to prolong

      the life of the filament?
      A Hydrogen Correct Answer Incorrect Answer
      B Nitrogen or Argon Correct Answer Incorrect Answer
      C Carbon dioxide Correct Answer Incorrect Answer
      D Oxygen Correct Answer Incorrect Answer

      Solution

      These are chemically inactive (inert) gases that prevent the tungsten filament from oxidizing or evaporating quickly.

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