Multiple choice

Which of the following processes adds sulphur dioxide to the air?

  1. Breakdown of glucose

  2. Roasting of metals

  3. Transpiration

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During roasting, the sulphide is converted to an oxide, and sulphur is released as sulphur dioxide, a gas. 'Roasting' is a step of the processing of certain ores. The technology is useful, but is also a serious source of air pollution.

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