The ionization potential for second He electron is
(a) 13.6 eV                 (b) 27.2 eV
(c) 54.4 eV                 (d) 100 eV

(c) For the ionization of second He electron. He+ will act as hydrogen like atom.
Hence ionization potential  =Z2×13.6 volt=22×13.6=54.4 V

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