Classification Of Elements And Periodicity In Properties Question 1
Question 1 - 25 January - Shift 1
Inert gases have positive electron gain enthalpy. Its correct order is
(1) $Xe<Kr<Ne<He$
(2) $He<Ne<Kr<Xe$
(3) $He<Xe<Kr<Ne$
(4) $He<Kr<Xe<Ne$
Show Answer
Answer: (3)
Solution:
Formula: Electron gain enthalpy
| Element | $\Delta$ egH $[KJ / mol]$ |
|---|---|
| $He$ | +48 |
| $Ne$ | +116 |
| $Kr$ | +96 |
| $Xe$ | +77 |
From NCERT
So, order is $Ne>Kr>Xe>He$
