The number of bonding and non-bonding electron pairs on the $N$ atom in $NO_3^-$ are respectively ..........

Identify the set of molecules in which the central atom has only one lone pair of electrons in their valence shells.

In which of the following species is the bond angle maximum?

Given below are two statements:
Statement $I$: The number of compounds among $SO_2$, $SO_3$, $SF_4$, $SF_6$ and $H_2S$ in which sulphur does not obey the Octet rule is $3$.
Statement $II$: Among $[H_2O, ClF_3, SF_4]$, $[NH_3, BrF_5, SF_4]$, $[BrF_5, ClF_3, XeF_4]$ and $[XeF_4, ClF_3, H_2O]$, the number of sets in which all the molecules have one lone pair of electrons on the central atom is $1$.

Which of the following molecules has the maximum number of lone pairs?

The number of species from the following which have a square pyramidal structure is $PF_{5}$,$BrF_{4}^{-}$,$IF_{5}$,$BrF_{5}$,$XeOF_{4}$,$ICl_{4}^{-}$.