MCQ
Which anion can undergo both oxidation and reduction?
- A$Cr_2O_7^{2-}$
- B$NO_3^-$
- C$OCl^-$
- ✓$S^{2-}$
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

$(A)$ $\sigma$ orbital has a total of two nodal planes.
$(B)$ $\sigma^*$ orbital has one node in the $x z$-plane containing the molecular axis.
$(C)$ $\pi$ orbital has one node in the plane which is perpendicular to the molecular axis and goes through the center of the molecule.
$(D)$ $\pi^*$ orbital has one node in the $x y$-plane containing the molecular axis.