Which of the sub-shell is spherical in shape?

Which of the following is correct on the basis of Hund's rule but does not follow Pauli's principle?

In the ground state of $Cr$,the number of electrons with $l = 1$ and $l = 2$ in its electronic configuration are respectively:

Which one of the following sets of quantum numbers represents an impossible arrangement?

Statement $A$: In a potassium atom,the $19^{th}$ electron enters the $4s$-orbital instead of the $3d$-orbital.
Reason $R$: The $(n + l)$ rule is followed to determine the minimum energy of an orbital.

What is the maximum number of electrons that can have the quantum numbers $n = 5$ and $m_l = +2$?