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The energy required to dislodge electron...

The energy required to dislodge electron from excited isolated H-atom `(IE_(1) = 13.6 eV)` is

A

`= 13.6 eV`

B

`gt 13.6 eV`

C

`lt 13.6` and `gt 3.4 eV`

D

`le 3.4 eV`

Text Solution

Verified by Experts

The correct Answer is:
D
`IE_(1)` is `13.6 eV`. This means that energy of lst orbital is `-13.6 eV`. The energy of 2nd orbit is `= (-13.6)/(4) = -3.4`. Their lowest excited state of H atom has electron in its 2nd orbital. Thus, the IE required is either 3.4 eV or less.
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