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Question

The ionization potential of an electron in the second orbit of He+ atom is

A
13.6 eV
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B
27.2 eV
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C
54.4 eV
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D
100 eV
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Solution

The correct option is C 54.4 eV
For the ionization of second He electron. He+ will act as hydrogen like atom.
Hence ionization potential
=Z2×13.6 volt=(2)2×13.6=54.4 V

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