Assertion (A): The ionization energy of Hydrogen atom is -13.6 eV.
Reason (R): -13.6 eV is the minimum energy required to free the electron from the first excited state.
Answer & explanation
Correct answer: option 4
As -13.6 eV is the ground state energy of hydrogen atom which contains only one electron so, this energy will be the same as required to remove an electron from the hydrogen atom's ground state i.e. the ionization energy.