Which of the following sets of quantum numbers is not valid?

Which of the following sets represents degenerate orbitals?

$A$ subshell with $l = 2$ is called?

Which of the following combination of statements is true regarding the interpretation of the atomic orbitals?
$1$. An electron in an orbital of high angular momentum stays further away from the nucleus than an electron in an orbital of lower angular momentum.
$2$. For a given value of the principal quantum number,the size of the orbit is inversely proportional to the azimuthal quantum number.
$3$. According to wave mechanics,the ground state angular momentum is equal to $\frac{h}{2\pi}$.
$4$. The plot of $\Psi$ vs $r$ for various azimuthal quantum numbers shows peak shifting towards higher $r$ values.

The number of angular and radial nodes of $4d$ orbital respectively are

Which of the following pairs of $d-$ orbitals will have electron density along the axes?