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6th Class Science Air Around us Question Bank Air Around us

  • question_answer
    Which of the following statement(s) is/are correct?

    A) In air percentage of nitrogen by volume is77%

    B) In air percentage of oxygen by volume is20%

    C) In air percentage of carbon dioxide is only2.0%

    D) In air percentage of water and argon is 1.0%

    Correct Answer: B

    Solution :

       


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