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Railways Sample Paper RRB (Group D) Sample Test Paper-2

  • question_answer
    Which one of the following is not a constituent of biogas?

    A)  Methane          

    B)  Carbon dioxide

    C)  Hydrogen         

    D)  Nitrogen dioxide

    Correct Answer: D

    Solution :

    [d] Nitrogen dioxide (NO-) is not a component of biogas.


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