JEE Main · 2021 · 18 Mar 2021 · Shift 2 · Atomic Structure

Bohr's model solves a single electron moving in the field of a nucleus, so it covers hydrogen and hydrogen-like ions such as $\mathrm{H}{\mathrm{e}}^{+}$ and $\mathrm{L}{\mathrm{i}}^{2+}$. The $\mathrm{L}{\mathrm{i}}^{+}$ ion still carries two electrons, and the repulsion between them falls outside the model, so the first statement fails. The model gives each orbit one fixed energy and contains nothing that would let a magnetic field separate a level into components, so it cannot account for the splitting of spectral lines in a magnetic field and the second statement holds. Statement I is false and Statement II is true.