If the binding energy of the electron in a hydrogen atom is 13.6 eV, the energy required to remove the electron from the first excited state of Li++ is
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a
122.4 eV
b
30.6 eV
c
13.6 eV
d
3.4 eV
answer is B.
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Detailed Solution
En=13.6n2×Z2. For first excited state n = 2 and for Li++,z=3⇒E=13.64×9=30.6eV