The shape of ethane $(C_2H_6)$ is........

What are the formal charges on the terminal oxygen atoms of the ozone $(O_3)$ molecule?

The bond angles of $NH_3$,$NH_4^+$,and $NH_2^-$ are in the order:

In molecules of the type $AX_2L_n$ (where $L$ represents lone pairs and $n$ is its number),there exists a bond between element $A$ and $X$. The $\angle XAX$ bond angle:

$AB_{3}$ is an interhalogen $T$-shaped molecule. The number of lone pairs of electrons on $A$ is $......$.

Which of the following is not correctly matched?