How many of the following species contain unpaired electron(s)?

${\mathrm{C}}_2^{+},{\mathrm{He}}_2^{+},{\mathrm{B}}_2^{-},{\mathrm{Be}}_2,{\mathrm{B}}_2$

The formal charge on $\mathrm{S}-$atom in the following structure is:

${\left[:\stackrel{..}{N}=C=\stackrel{..}{S}:\right]}^{-}$

How many of the following species contain ${\mathrm{sp}}^3$ hybridized central atom?

 ${\mathrm{SO}}_2,\mathrm{ }{\mathrm{SO}}_3,\mathrm{ }{\mathrm{Cl}}_2\mathrm{O},\mathrm{ }{\mathrm{H}}_2\mathrm{O},\mathrm{ }{\mathrm{SF}}_{4, }{\mathrm{ClO}}_3^{-},\mathrm{ }{\mathrm{NO}}_3^{-},\mathrm{ }{\mathrm{CO}}_3^{2-},\mathrm{ }{\mathrm{PH}}_3,\mathrm{ }{\mathrm{XeF}}_4,\mathrm{ }{\mathrm{XeO}}_3,\mathrm{ }{\mathrm{XeO}}_4$ and ${\mathrm{NH}}_4^{+}$ .

Identify correct number of statements
$\left(\mathrm{i}\right)$ Chloral hydrate shows intramolecular $\mathrm{H}$ –bond.

$\left(\mathrm{ii}\right)$ Uni-negative anion of caro’s acid shows intramolecular $\mathrm{H}$ –bond

$\left(\mathrm{iii}\right)$ Order of bond angle ${\mathrm{Cl}}_2\mathrm{O}>{\mathrm{F}}_2\mathrm{O}$

$\left(\mathrm{iv}\right)$ Order of bond angle ${\mathrm{F}}_2\mathrm{O}<{\mathrm{H}}_2\mathrm{O}$

$\left(\mathrm{v}\right)$ Order of bond angle As${\mathrm{AsI}}_3>{\mathrm{AsBr}}_3>{\mathrm{AsCl}}_3$

$\left(\mathrm{vi}\right)$ ${\mathrm{BF}}_3, {\mathrm{CH}}_4, {\mathrm{PCl}}_5, {\mathrm{SF}}_6, {\mathrm{IF}}_7, {\mathrm{XeF}}_4$ all are Non–polar

$\left(\mathrm{vii}\right)$ p-nitrophenol has less boiling point as compared to $\mathrm{o}$ –nitrophenol

$\left(\mathrm{viii}\right)$ In trisilyl amine ${\left({\mathrm{SiH}}_3\right)}_3\mathrm{N}$, the $\mathrm{Si}—\mathrm{N}$ bond length is lesser than expected value

$\left(\mathrm{ix}\right)$The $\mathrm{Be}$ atom in ${\mathrm{BeCl}}_2\left(\mathrm{s}\right)$ is ${\mathrm{sp}}^3$ hybridised.