The atomic number of $Sn$ is $50$. The shape of gaseous $SnCl_{2}$ molecule is

How many lone pairs of electrons are present on the chlorine atom in chlorous acid $(HClO_2)$?

The number of molecules having a lone pair of electrons on the central atom in the following is: $BF_3, SF_4, SiCl_4, XeF_4, NCl_3, XeF_6, PCl_5, HgCl_2, SnCl_2$

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

The bond angle in a water molecule is nearly or directed bonds in water form an angle of:

The compound$(s)$ with $2$ lone pairs of electrons on the central atom is(are):
$(A)$ $BrF_5$
$(B)$ $ClF_3$
$(C)$ $XeF_4$
$(D)$ $SF_4$