How is biogas produced?

  • A
    By burning plastic and paper waste.
  • B
    By anaerobic decomposition of organic waste in the presence of water and specific bacteria.
  • C
    By chemical synthesis of methane from carbon dioxide.
  • D
    By electrolysis of water mixed with organic matter.

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How is non-degradable industrial solid waste disposed of?

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Smog is primarily caused by the presence of which of the following?

The possibility of photochemical smog formation will be minimum at

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