What is the formal charge on the $N$ atom in the $NH_4^{+}$ ion?

Compound $X$ is the anhydride of sulphuric acid. The number of $\sigma$ bonds and the number of $\pi$ bonds present in $X$ are respectively:

Which of the following bond angle orders is correct?

The correct increasing order of the total number of $\sigma$ and $\pi$ bonds in the following structures is:
$I. \ H_2S_2O_6, \ II. \ H_2SO_3, \ III. \ H_2SO_5$

For the ozone molecule,consider the following statements:
$(A)$ It is a linear molecule with a bond angle of $180^{\circ}$.
$(B)$ It is an angular molecule with a bond angle of $117^{\circ}$.
$(C)$ The bond lengths of both $O-O$ bonds are the same.
$(D)$ With respect to oxygen,it is thermodynamically more stable.
The correct options are:

Which of the following odd electron species is planar?