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JEE Main202325 Jan 2023Morning ShiftChemistryp Block Elements (Group 15, 16, 17 & 18)Actual

Inert gases have positive electron gain enthalpy. Its correct order is

Options

  1. AXe < Kr < Ne < He
  2. BHe < Ne < Kr < Xe
  3. CHe < Xe < Kr < Ne
  4. DHe < Kr < Xe < Ne

Correct answer

C. He < Xe < Kr < Ne

Step-by-step solution

All the given elements belong to the group - 18. All noble gases have general electronic configuration ns 2 np 6 except helium which has 1 s 2 . Since noble gases have stable electronic configuration, they have no tendency to accept the electron and therefore, have large positive values of electron gain enthalpy. Values of electron gain enthalpy of all the elements are given in the below table Element Δ egH [ KJ / mol ] He + 48 Ne + 116 Kr + 96 Xe + 77 So, the order is He   <   Xe   < &#

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