Biogas contains:

  • A
    $CH_4, C_2H_5OH, N_2, O_2$
  • B
    $CH_4, CO, H_2, N_2, H_2S$
  • C
    $CO_2, H_2, N_2, O_2$
  • D
    $CH_4, CO_2, H_2, N_2, H_2S$

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