2. Sample Papers
  3. 9th Class
  4. Science

9th Class Science Sample Paper Science Olympiad Model Test Paper-21

  • question_answer
    Which among the following is the most dangerous for ozone layer?

    A) Chlorine

    B) Fluorine

    C) Hydrogen

    D) Chlorofluorocarbon

    E) None of these

    Correct Answer: D

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