Potassium acid oxalate ${\mathrm{K}}_2{\mathrm{C}}_2{\mathrm{O}}_4.3{\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4.4{\mathrm{H}}_2\mathrm{O}$ can be oxidized by ${\mathrm{MnO}}_4^{-}$ in acid medium. Calculate the voluem of $(\mathrm{in} \mathrm{mL}) 1 \mathrm{M} {\mathrm{KMnO}}_4$ reacting in acid solution with $5.08$ gram of the acid oxalate.

In the following reaction, ${\mathrm{SO}}_2$ acts as a reducing agent:

${\mathrm{SO}}_2+{\mathrm{Cl}}_2+2{\mathrm{H}}_2\mathrm{O} \stackrel{ }{\to } {\mathrm{H}}_2{\mathrm{SO}}_4+2\mathrm{HCl}$

Find the equivalent weight of ${\mathrm{SO}}_2$.

In the titration of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ and ferrous sulphate, following data is obtained,

${\mathrm{V}}_1 \mathrm{mL}$ of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ solution of molarity ${\mathrm{M}}_1$ requires ${\mathrm{V}}_2 \mathrm{mL}$of ${\mathrm{FeSO}}_4$ solution of molarity ${\mathrm{M}}_2.$

Which of the following relations is/are true for the above titration?

If mass of ${\mathrm{KHC}}_2{\mathrm{O}}_4$ ( potassium acid oxalate) is required to reduce $100 \mathrm{mL}$ of $0.02 \mathrm{M} {\mathrm{KMnO}}_4$ in acidic medium is $\mathrm{x} \mathrm{g}$ and to neutralise $100 \mathrm{mL}$ $0.05 \mathrm{M} \mathrm{Ca}(\mathrm{OH}{)}_2$ is $\mathrm{y} \mathrm{g},$ then which of the following options may be correct?

The number of acids having central atom in $+3$ oxidation state among the following:
$\left(\mathrm{a}\right)$ ${\mathrm{HNO}}_2$
$\left(\mathrm{b}\right)$ ${\mathrm{HNO}}_3$
$\left(\mathrm{c}\right)$ ${\mathrm{H}}_3{\mathrm{PO}}_2$
$\left(\mathrm{d}\right)$ ${\mathrm{H}}_3{\mathrm{PO}}_3$
$\left(\mathrm{e}\right)$ ${\mathrm{H}}_3{\mathrm{PO}}_4$
$\left(\mathrm{f}\right)$ ${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_5$
$\left(\mathrm{g}\right)$ ${\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_7$
$\left(\mathrm{h}\right)$ ${\mathrm{H}}_2{\mathrm{SO}}_3$
$\left(\mathrm{i}\right)$ ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_7$
$\left(\mathrm{j}\right)$ ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$
$\left(\mathrm{k}\right)$ ${\mathrm{H}}_2{\mathrm{SO}}_4$