Ncert Exercises & Solutions

In the preparation of compounds of Xe, Bartlett had taken $O_{2}^{+} {PtF}_{6}^{-}$ as a base compound. This is because-

1.	Both O₂and Xe have the same size.
2.	Both O₂ and Xe have the same electron gain enthalpy.
3.	Both O₂ and Xe have almost the same ionisation enthalpy.
4.	Both Xe and O₂ are gases.

Hint: Both O₂ and Xe have almost the same ionisation enthalpy.

Bartlett prepared a red compound which is formulated as

O_{2}^{+} {PtF}_{6}^{-}

. Then he realised that the first ionisation enthalpy of molecular oxygen (1175 kJmol–1) was almost identical to that of xenon (1170 kJ mol^–1).

The ionisation enthalpies of noble gases are the highest in their respective periods due to their stable electronic configurations.

Hence, option third is the correct answer

size of Oxygen is 48 pm, and Xenon 108 pm

Ea of Xenon = zero,

Ea of oxygen = 141kj/mol