Chemistry - Redox Reactions Question with Solution | TestHub

In the balanced redox reaction

$x{\mathrm{As}}_2{\mathrm{S}}_3+y{\mathrm{NO}}_3^{-}+4{\mathrm{H}}_2\mathrm{O}\to a{\mathrm{AsO}}_4^{3-}+b\mathrm{NO}+c{\mathrm{SO}}_4^{2-}+8{\mathrm{H}}^{+}$ molar ratio of

x : y = 3 : 24. 

When ${\mathrm{NH}}_4\mathrm{SCN}$ oxidized into ${\mathrm{SO}}_4{}^{2-},{\mathrm{CO}}_3{}^{2-}$ and ${\mathrm{NO}}_3{}^{-}$, its equivalent weight will be $\mathrm{M}/24$, where M is molar mass.

When ${\mathrm{Bi}}_2{\mathrm{S}}_3$ converted into ${\mathrm{Bi}}^{5+}$ and S , n-factor of ${\mathrm{Bi}}_2{\mathrm{S}}_3$ will be 7 .

Equivalent weight of ${\mathrm{H}}_3{\mathrm{PO}}_2$ when it disproportionate into ${\mathrm{PH}}_3$ and ${\mathrm{H}}_3{\mathrm{PO}}_3$ is $\frac{4\mathrm{M}}{3}$.