If the binding energy (in eV) of the electron in a hydrogen atom is 13.6 eV, the energy (in eV ) required to remove the electron from the first excited state of Li++ is

For lithium, E2=−13.6z2n2                          =−13.6×3222                          =−30.6eV  So energy needed to remove the electron                                                     =30.6eV