SSC MTS EXAM

Detailed explanation-1: -During melting, energy goes exclusively to changing the phase of a substance; it does not go into changing the temperature of a substance. Hence melting is an isothermal process because a substance stays at the same temperature.

Detailed explanation-2: -1, the temperature of a substance does not change as the substance goes from one phase to another. In other words, phase changes are isothermal (isothermal means “constant temperature”). Again, consider H2O as an example. Solid water (ice) can exist at 0°C.

Detailed explanation-3: -The conversion of matter from one state to another is called a phase change. This process occurs when a large amount of energy is gained or lost. Phase change also depends on factors like pressure and temperature.

Detailed explanation-4: -True; During phase change from liquid to vapour, the amount of heat energy is utilized to change its state only. As during phase change, temperature remains constant, the heat absorbed is only utilized to change the vibrational energy of the system; change the degree of freedomness of molecules.