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The energy of an electron in first Bohr orbit of H -atom is -13.6 eV .The energy value of electron in the excited state of $\;Li^{2+}\;$ is :

$(a)\;-27.2\;eV \qquad(b)\;30.6\;eV\qquad(c)\;-30.6\;eV\qquad(d)\;27.2\;eV$

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