Chemistry 0620 · IGCSE · Air quality and climate

Air quality and climate — practice question

The three air pollutants, X, Y and Z, are outlined below. X is a poisonous gas produced when an alkane undergoes incomplete combustion. Y is produced when vegetation decomposes and it adds to global warming. Z leads to breathing difficulties and acid rain. What are the identities of X, Y and Z?

  • AX: carbon monoxide, Y: methane, Z: oxides of nitrogen
  • BX: carbon monoxide, Y: particulates, Z: carbon dioxide
  • CX: sulfur dioxide, Y: methane, Z: oxides of nitrogen
  • DX: sulfur dioxide, Y: particulates, Z: carbon dioxide

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