Which one among the following statements about matter is NOT correct?
- AOn increasing the temperature of solids, the kinetic energy of particles increases
- BThe maximum temperature at which a solid melts to become a liquid at atmospheric pressure is called its melting point
- CParticles of steam have more energy than water at 100°C
- DDirect change of gas to solid is called deposition
Explanation
Statement A is correct: heating a solid increases the kinetic energy (vibrational energy) of its particles. Statement C is correct: at 100°C, steam carries the latent heat of vaporisation (about 2260 kJ/kg) in addition to the sensible heat of water, so steam particles have more energy than liquid water at the same temperature. Statement D is correct: the direct conversion of a gas to a solid (e.g., formation of frost or iodine crystals) is called deposition (desublimation). Statement B is NOT correct: the melting point is the single characteristic temperature at which a pure solid and its liquid coexist in equilibrium at atmospheric pressure — it is not a 'maximum temperature', a phrasing that wrongly suggests melting occurs over a range with an upper limit.