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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ph219

First ionisation enthalpies (): He 2372, Ne 2081, Ar 1521, Kr 1351, Xe 1170, Rn 1037; 1175. Select the correct statement(s).

  1. ABartlett expected to oxidise Xe because the ionisation enthalpy of Xe is close to that of
  2. BThe tendency to form fluorides rises down the group as the ionisation enthalpy falls, so Kr and Xe form fluorides much more readily than He and Ne
  3. C is a stable compound at room temperature
  4. DHelium is mixed with oxygen for deep-sea diving because it is much less soluble in blood than nitrogen

Answer: A, B, D

(1175) and Xe (1170) have nearly equal ionisation enthalpies, and was known, so was predicted. Lower ionisation enthalpy makes compound formation easier, so Kr and Xe react while He and Ne do not. No argon fluoride is stable at room temperature. He is poorly soluble in blood, so it is used in diving mixtures. Options 1, 2 and 4 are correct.
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