Chemistry 0620 · IGCSE · Air quality and climate

Air quality and climate — practice question

Plant waste is sometimes put into a bin, where it breaks down. The compost produced is then used to add nutrients to soils. Which gas is likely to be found in a greater percentage inside the bin than in the air outside it?

  • Acarbon monoxide
  • Bmethane
  • Coxygen
  • Dsulfur dioxide

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