In which changes do the particles become more widely spaced? 1. A gas is heated from $0\,^{\circ}\text{C}$ to $25\,^{\circ}\text{C}$. 2. Pressure is exerted on a gas at a constant temperature. 3. Steam changes into water by condensation. 4. Water turns into vapour at room temperature.
- A1 and 2
- B1 and 4
- C2 and 3
- D3 and 4