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The process requiring the absorption of ...

The process requiring the absorption of energy is

A

`Cl-Cl^(-)`

B

`O^(-)rarrO^(2-)`

C

`Fe^(3+)rarrFe^(2+)`

D

`Ar rarrAr^(-)`

Text Solution

Verified by Experts

The correct Answer is:
B, D
Addition of second electron to `O^(-)` is opposed by electrostatic repulsion due to same charge. Hence energy is given for the addition of second electron.
Ar has stable electronic configuration `(ns^(2)np^(6))`. Hence energy has to be given to add an extra electron to form `Ar^(-)`.
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