A scientist measures the pH of rain at three sites.
| Site | pH of rain |
|---|---|
| P | 4 |
| Q | 6 |
| R | 5 |
Statement 1: The concentration of H+\mathrm{H^{+}}H+ ions in the rain at P is 100 times the concentration at Q.
Statement 2: The rain at R is the least acidic.
Statement 3: The concentration of H+\mathrm{H^{+}}H+ ions in the rain at Q is 10 times the concentration at R.
Which statements are correct?
1 only
1 and 2 only
1 and 3 only
2 and 3 only
53 exam-style questions on OCR GCSE Chemistry 3.3 Types of chemical reactions, covering 3.3.1 Oxidation and reduction in terms of oxygen, 3.3.2 Acids, alkalis and neutralisation, 3.3.3 The pH scale and measuring pH, 3.3.4 Oxidation and reduction in terms of electrons, 3.3.5 Dilute and concentrated, weak and strong acids, and 3.3.6 Hydrogen ion concentration and pH. Each one has a worked solution and a mark scheme showing where the marks go.