Three metal compounds, P, Q and R, are heated with a Bunsen burner. The observations are given below. P: a colourless gas is given off, which relights a glowing splint Q: a colourless gas is given off, which turns limewater milky R: no change occurs Which row identifies P, Q and R?
- AP: magnesium carbonate, Q: potassium carbonate, R: potassium nitrate
- BP: magnesium carbonate, Q: potassium nitrate, R: potassium carbonate
- CP: potassium nitrate, Q: magnesium carbonate, R: potassium carbonate
- DP: potassium nitrate, Q: potassium carbonate, R: magnesium carbonate