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      Question

      Which of the following is the ratio of Oxygen to

      Nitrogen in the air?
      A 1 : 4 Correct Answer Incorrect Answer
      B 2 : 3 Correct Answer Incorrect Answer
      C 3 : 2 Correct Answer Incorrect Answer
      D 4 : 1 Correct Answer Incorrect Answer

      Solution

      The correct answer is A

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