JEE Main · 2019 · 09 Jan 2019 · Shift 2 · Atomic Structure

Judge the four statements. An electron in a higher angular-momentum orbital does on average stay farther from the nucleus, so the first statement is sound. The claim that orbital size is simply inversely proportional to the azimuthal quantum number is false, and the claim that the ground-state angular momentum equals $\frac{h}{2\pi }$ is the old Bohr value -- wave mechanics puts the $1s$ angular momentum at zero. The last statement, that the radial plot peaks at higher $r$ as the azimuthal quantum number changes for a given $n$, is correct. So the correct pair is the first and fourth statements.