Which of the following electronic configurations is not possible according to Hund's rule?

Which two orbitals are located along the axes and not between the axes?

In a given atom,no two electrons can have the same values for all the four quantum numbers. This is called:

Which statement is true regarding the hydrogen atom?

Which of the following orbitals has/have zero probability of finding the electron in the $xy$ plane?

Which of the following statement$(s)$ is/are true?
$A$. If two orbitals have the same value of $(n+l)$, the orbital with lower value of $n$ will have lower energy.
$B$. Energies of the orbitals in the same subshell increase with increase in atomic number.
$C$. The size of $2p_x$ orbital is less than the size of $3p_x$ orbital.
$D$. Among $5f, 6s, 4d, 5p$ and $5d$ orbitals, none of the orbitals have $2$ radial nodes.