Liquifaction Of Gases

During adsorption, the gas molecules are attracted to the surface of the solid, which results in the formation of a bond between the gas and the solid. Adsorption is an exothermic process (releases heat), which implies that the change in enthalpy is negative. The entropy of the system decreases because the gas molecules become more ordered as they are adsorbed onto the solid surface, resulting in a decrease in randomness. The Gibbs free energy change for the adsorption process is negative, indicating that the process is spontaneous. This can be explained by the relation: Since both and , the process can still be spontaneous if the enthalpy change is sufficiently negative to overcome the negative entropy change.

The correct option is (B): ΔG < O, ΔH < O, ΔS < O

Greenhouse gases are those that can trap heat in the Earth's atmosphere and contribute to the greenhouse effect. These gases include:
(Nitrogen dioxide)
CFC (Chlorofluorocarbons)
(Carbon dioxide) However, (Oxygen) is not considered a greenhouse gas because it does not have the ability to trap heat in the atmosphere. While it is essential for life on Earth, it does not absorb and emit infrared radiation in the way greenhouse gases do. Thus, the correct answer is , which is not a greenhouse gas.

The correct option is(D):