Which of the following sets of orbitals may be degenerate

Which of the following sets of orbitals are degenerate and why ? (i) 1s, 2s and 3s in Mg atom (ii) 2p_x, 2p_y and 2p_z in C atom (iii) 3s, 3p_x and 3d orbitals in H atom.

In a homonuclear molecule which of the following set of orbitals are degenerate ?

In a hononuclear molecules, which of the following set of orbitals is degenerate?

In the presence of strong electrical field, the following set of orbitals are not degenerate

Which of the following orbitals are degenerate for [Cr(H_(2)O)_(6)]^(3-)