Chemistry · May / June 2025 · Paper 12 · Question 29

The domestic water supply is treated before it is supplied to houses. Three treatments are listed. ● sedimentation and filtration ● treatment with chlorine ● treatment with carbon Which row shows the purpose of the treatments?

1. Asedimentation and filtration: kills microbes; treatment with chlorine: removes solids; treatment with carbon: removes unpleasant tastes and odours
2. Bsedimentation and filtration: removes solids; treatment with chlorine: kills microbes; treatment with carbon: removes unpleasant tastes and odours
3. Csedimentation and filtration: removes solids; treatment with chlorine: removes unpleasant tastes and odours; treatment with carbon: kills microbes
4. Dsedimentation and filtration: removes unpleasant tastes and odours; treatment with chlorine: kills microbes; treatment with carbon: removes solids

As printed in the paper