The number of acidic oxides among the following is :
(a) ${\mathrm{N}}_2\mathrm{O}$
(b) $\mathrm{NO}$
(c) ${\mathrm{N}}_2{\mathrm{O}}_3$
(d) ${\mathrm{N}}_2{\mathrm{O}}_4$
(e) ${\mathrm{N}}_2{\mathrm{O}}_5$
(f) ${\mathrm{P}}_4{\mathrm{O}}_6$
(g) ${\mathrm{P}}_4{\mathrm{O}}_{10}$
(h) ${\mathrm{SO}}_3$
(i) ${\mathrm{B}}_2{\mathrm{O}}_3$
(j) $\mathrm{CO}$

The number of gaseous oxides among the following at room temperature is :
(a) ${\mathrm{N}}_2\mathrm{O}$
(b) $\mathrm{NO}$
(c) ${\mathrm{N}}_2{\mathrm{O}}_5$
(d) ${\mathrm{NO}}_2$
(e) ${\mathrm{P}}_4{\mathrm{O}}_6$
(f) ${\mathrm{P}}_4{\mathrm{O}}_{10}$
(g) ${\mathrm{SO}}_2$
(h) ${\mathrm{SO}}_3$

The number of $\mathrm{O}-$atoms having ${\mathrm{sp}}^2$ hybridisation in ${\mathrm{P}}_4{\mathrm{O}}_{10}$ molecule is : 

$x{\mathrm{P}}_4+{\mathrm{ySO}}_2{\mathrm{Cl}}_2\to$

then $\mathrm{y}/\mathrm{x}$ $\text{?}$

Complete hydrolysis product of $1$ mole each of following will need how many total number of moles of $\mathrm{NaOH}$ for complete neutralisation?

${\mathrm{SOCl}}_2, {\mathrm{SO}}_2{\mathrm{Cl}}_2, {\mathrm{PCl}}_3, {\mathrm{PCl}}_5, {\mathrm{NCl}}_3$

An aqueous solution of how many of the following species turn blue litmus red?

$\left(\mathrm{i}\right)$ ${\mathrm{SF}}_4$ 

$\left(\mathrm{ii}\right)$ ${\mathrm{PCl}}_3$

$\left(\mathrm{iii}\right)$ ${\mathrm{N}}_2\mathrm{O}$

$\left(\mathrm{iv}\right)$ ${\mathrm{NO}}_2\mathrm{Cl}$

$\left(\mathrm{v}\right)$ ${\mathrm{SF}}_6$

$\left(\mathrm{vi}\right)$ ${\mathrm{SeF}}_6$

$\left(\mathrm{vii}\right)$ ${\mathrm{AsCl}}_3$

$\left(\mathrm{viii}\right)$ ${\mathrm{POCl}}_3$

$\left(\mathrm{ix}\right)$ ${\mathrm{SO}}_2$

$\left(\mathrm{x}\right)$ ${\mathrm{SO}}_2{\mathrm{Cl}}_2$

$\left(\mathrm{xi}\right)$ ${\mathrm{SOCl}}_2$

$\left(\mathrm{xii}\right)$ ${\mathrm{COCl}}_2$

$\left(\mathrm{xiii}\right)$ ${\mathrm{CCl}}_4$

How many of the following compounds are possible products when chlorine is passed through hyposolution.

$\left(\mathrm{i}\right)$ $\mathrm{S}$

$\left(\mathrm{ii}\right)$ $\mathrm{HCl}$

$\left(\mathrm{iii}\right)$ ${\mathrm{Na}}_2\mathrm{S}$

$\left(\mathrm{iv}\right)$ ${\mathrm{Na}}_2{\mathrm{SO}}_4$

$\left(\mathrm{v}\right)$ ${\mathrm{Na}}_2{\mathrm{S}}_4{\mathrm{O}}_6$

$\left(\mathrm{vi}\right)$ ${\mathrm{HClO}}_4$

How many compound(s) or ion(s) can be oxidised by ${\mathrm{H}}_2{\mathrm{O}}_2$ among the following:

$\left(\mathrm{i}\right)$ ${\mathrm{AsO}}_3^{3-}$

$\left(\mathrm{ii}\right)$ ${\mathrm{SO}}_4^{2-}$

$\left(\mathrm{iii}\right)$ ${\mathrm{Fe}}_2{\left({\mathrm{SO}}_4\right)}_3$

$\left(\mathrm{iv}\right)$ ${\mathrm{NH}}_2-{\mathrm{NH}}_2$

$\left(\mathrm{v}\right)$ ${\mathrm{H}}_2\mathrm{S}$

$\left(\mathrm{vi}\right)$ $\mathrm{PbS}$

$\left(\mathrm{vii}\right)$ ${\mathrm{O}}_3$