In which of the following sets,all the given species are isostructural?

In the $BrF_3$ molecule,the equatorial lone pairs minimize which of the following?

Which of the following molecules has two lone pairs of electrons in the valence shell of its central atom?

Although the geometries of $NH_{3}$ and $H_{2}O$ molecules are based on a distorted tetrahedral arrangement,the bond angle in water is less than that of ammonia. Discuss.

What is the number of lone pair of electrons on the central halogen atom in $BrF_3$?

Identify the molecule $(X)$ with the maximum number of lone pairs of electrons (obtained using Lewis dot structure) among $HNO_{3}$, $H_{2}SO_{4}$, $NF_{3}$, and $O_{3}$. Choose the correct bond angle made by the central atom of the molecule $(X)$. (in $^{\circ}$)