Which of the following species contains three bond pairs and one lone pair around the central atom?

Match List-$I$ with List-$II$ :

List-$I$ (Compound / Species)	List-$II$ (Shape / Geometry)
$A$. $SF_4$	$I$. Tetrahedral
$B$. $BrF_3$	$II$. Pyramidal
$C$. $BrO_3^{-}$	$III$. See-saw
$D$. $NH_4^{+}$	$IV$. Bent $T$-shape

Choose the correct answer from the options given below :

The correct increasing order of the number of lone pairs of electrons on the central atom of $SnCl_2$,$XeF_2$,$ClF_3$,and $SO_3$ is:

$(a)$ Bond angle in $PH_{4}^{+}$ is higher than that in $PH_{3}$. Why?
$(b)$ What is formed when $PH_{3}$ reacts with an acid?

Which of the following statements are true or false?
$(A)$ All the bond angles $\angle Cl-P-Cl$ are $90^{\circ}$ in $PCl_5$.
$(B)$ The bond length of $P-Cl$ in the axial position is more than the equatorial position in $PCl_5$.
$(C)$ $PCl_5$ is a nonreactive molecule.
$(D)$ In $PCl_5$,the hybridization is $sp^3d$ and it has a pyramidal structure.

The geometry with respect to the central atom of the following molecules are: $N(SiH_3)_3;\, Me_3N;\, (SiH_3)_3P$