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5th Class Science Sample Paper Science Olympiad Model Test Paper-21

  • question_answer
    Which among the following is incorrect for the nitrogen gas?

    A) Nitrogen constitutes about 78% of air.

    B) Nitrogen is used in fertilizers.

    C) Nitrogen is essential for burning process to take place.

    D) Atmospheric nitrogen is used by some plants with the help of bacteria.

    E) None of these

    Correct Answer: C

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