Statement I : Hydrogen has only one electron in its orbit but produces several spectral linesStatement II : There are many excited energy levels available in a sample of Hydrogen gas

Statement I : Only one electron is present in H-atom and produce H-spectrum has several lines, Thus Statement I is trueStatement II : Each line in H-spectrum indicates various electronic transitions. A sample of Hydrogen contains large number of H-atoms in which the electrons get excited to different excited states and get deexcited to grand state in different ways. Thus H-spectrum has several spectral lines Statement II explains Statement I.