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  3. 6th Class
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6th Class Science Sample Paper Science Olympiad Model Test Paper-7

  • question_answer
    Which one of the following statements about air is true?

    A) Air is opaque

    B) Air is a mixture of only five gases

    C) Air does not contain dust and smoke

    D) Amount of carbon dioxide in air is less than 1%

    E) None of these

    Correct Answer: D

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