If ioinsation potential of hydrogen atom is 13.6 eV, then ionisation potential of `He^(+)`will be
A. 54.4 eV
B. 6.8 eV
C. 13.6 eV
D. 24.5 eV

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Correct Answer - A
`(I.E)_(He^(+))=(I.E)_(H)xxZ^(2)=13.6xx4=54.4eV`

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