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Mistake in sol. the atom is already excited so the energy required will be little less than 13.6
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In an excited hydrogen atom, the electron must be present in excited state i.e. n = 2 or in higher excited states. Energy of first excited state, E2 = -13.6/2^2 = -3.4 eV.
rnHence, the ionization energy for excited hydrogen atom will be 3.4 eV or less.
rnThus, option (a) is correct.
rn