2. Questions Bank
  3. 7th Class
  4. Science
  5. Physical and Chemical Changes

7th Class Science Physical and Chemical Changes Question Bank Physical and Chemical Changes

  • question_answer
    ____ is produced when anaerobic bacteria digest animal waste.

    A) Hydrogen gas

    B)        Biogas

    C) Nitrogen gas                  

    D) Sulphur dioxide gas

    E) None of these

    Correct Answer: B

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