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JEE Main 202325 JanuaryMorning Shift
Exam
JEE Main
Year
2023
Date
25 January
Shift
Morning Shift
Subject
Chemistry
Chapter
p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2023 · 25 January · Morning Shift · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

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

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

Options

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

Correct answer

C. He<Xe<Kr<NeHe < Xe < Kr < Ne

Step-by-step solution

All the given elements belong to the group - 18. All noble gases have general electronic configuration ns2np6{ns}^{2}{np}^{6} except helium which has 1s21{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 δegH[KJ/mol]\delta egH [ KJ / mol ]
HeHe +48+ 48
NeNe +116+ 116
KrKr +96+ 96
XeXe +77+ 77

So, the order is He<Xe<Kr<NeHe < Xe < Kr < Ne.

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