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Ground state energy of H-atom is -13.6 eV. The energy needed to ionise H-atom from its second excited state is

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Ground state energy of H-atom is -13.6 eV. The energy needed to ionise H-atom from its second excited state is
A. `1.51` eV
B. `3.4` eV
C. `13.6` eV
D. `12.1` eV
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Correct Answer - A
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