Non-renewable Energy Sources: Fossil Fuels

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Multiple Choice

Main constituents of coal gas are

  1. $H _2O,\, C _2H _6,\, O _2$
  2. $CH _4,\, CO _2,\, O _2$
  3. $CH _4,\, H _2,\, CO$
  4. $C _2H _6,\, N _2,\, O _2$
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