Why are the gases helium and hydrogen not liquified at room temperature by applying very high pressure?

Why is N_2 less reactive at room temperature?

Two differen gases 'A' and 'B' are filled in separate containers of equal capacity under the same conditions of temperature and pressure. On increasing the pressure slightly, the gas 'A' liquefies but gas B does not liquefy even on applying high pressure until it is cooled. Explain this phenomenon.

Why is zinc oxide white at low temperature and yellow at high temperature?

Real gases behave ideally at low temperature and high pressure. b) Justify.

Why eclipsed and staggered forms of ethane cannot be isolated at room temperature?

Why do gases always tend to be less soluble in liquids as the temperature is raised?

Alcohols can be prepared by treating alkyl halide with aqueous NaOH at room temperature and atmospheric pressure. Can we prepare phenol from halobenzene and aqueous NaOH at the same conditions? Justify.

Alcohols can be prepared by treating alkyl halide with aqueous NaOH at room temperature and atmospheric pressure. You are given aniline, NaNO_2 and dilute HCl. Suggest a method to prepare phenol using these reagents. Write equations for the reactions.

Statement 1 : When hydrogen gas at high pressure and room temperature expands adiabatically into a region of low pressure, there is a decrease in temperature. Statement 2 : Hydrogen gas at room temperature is above its inversion temperature.