In $NO_3^{-}$ ion,the number of bond pairs and lone pairs of electrons on the nitrogen atom are

Draw the structure of chlorous acid $(HClO_2)$.

What is the bond angle in $ClO_2$ (OClO) (in $^{\circ}$)?

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 $1$.

How many types of $F-S-F$ bond angles are present in $SF_4$?

Which of the following has a tetrahedral shape?