OCR GCSE Chemistry B · J258
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Problems and reduction of pollutantsPower-station and industrial flue gases can be treated before they enter the atmosphere. In a gas scrubber, the gases contact an alkaline material such as calcium oxide, calcium hydroxide or powdered limestone, which contains calcium carbonate. The alkaline substance neutralises acidic sulfur dioxide.