The bond angle in ammonia molecule is

Which of the following molecules has a regular geometry as expected?

In compounds of type $ECl_3$,where $E = B, P, As$ or $Bi$,the angles $\angle Cl-E-Cl$ for different $E$ are in the order

Bromine trifluoride autoionizes to form $BrF_2^+$ and $BrF_4^-$. The shapes of the cation and anion are respectively . . . . . . ,and . . . . . . .

The structures of $O_3$ and $N_3^-$ are

$BF_3$ is used as a catalyst in several industrial processes due to its