An amount of solid NH4HS is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm. Pressure. Ammonium hydrogen sulphide decomposes to yield NH₃ and H₂S gases in the flask. When the decomposition reaction reaches equilibrium, the total pressure in the flask rises to 0.84 atm. The equilibrium constant for NH₄HS decomposition at this temperature is :

Which one of the following species is diamagnetic in nature?

Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point :

Which of the following statements in relation to the hydrogen atom is correct?