Embibe Experts Solutions for Chapter: Redox Reactions, Exercise 3: Level 3

${\mathrm{ClO}}_2$ reacts with water and alkali to give:

Hydrogen peroxide in aqueous solution decomposes on warming to give oxygen according to the equation: $2{\mathrm{H}}_2{\mathrm{O}}_2\left(\mathrm{aq}\right)⟶2{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)+{\mathrm{O}}_2 \left(\mathrm{g}\right)$ under conditions where $1$ mole of gas occupies $24{\mathrm{dm}}^3$. $100 {\mathrm{cm}}^3$ of $\mathrm{XM}$ solution of ${\mathrm{H}}_2{\mathrm{O}}_2$ produces $3{\mathrm{dm}}^3$ of ${\mathrm{O}}_2$. Thus, $\mathrm{X}$ is:

The oxidation states of sulphur in the anions ${\mathrm{SO}}_3{}^{2-}, {\mathrm{S}}_2{{\mathrm{O}}_4}^{2-}$ and ${\mathrm{S}}_2{{\mathrm{O}}_6}^{2-}$ follow the order:

Match List$-\mathrm{I}$ (Compounds) with List$-\mathrm{II}$ (Oxidation states of Nitrogen) and select the answer using the codes given below the lists:

The resonating structures of the cyanate ion are . The correct set of the oxidisation states of $\mathrm{O}, \mathrm{C} \& \mathrm{N}$, respectively, with the most stable structure out of the above is:

${\mathrm{CN}}^{-}$ is oxidised by ${\mathrm{NO}}_3^{-}$ in the presence of an acid : ${\mathrm{aCN}}^{-}+{\mathrm{bNO}}_3^{-}+{\mathrm{cH}}^{+}⟶\left(\mathrm{a}+\mathrm{b}\right)\mathrm{NO}+{\mathrm{aCO}}_2+\frac{\mathrm{c}}{2}{\mathrm{H}}_2\mathrm{O}$. What are the whole number values of $\mathrm{a}, \mathrm{b}, \mathrm{c}$ in that order?

For the redox-reaction ${\mathrm{MnO}}_4^{-}+{\mathrm{C}}_2{\mathrm{O}}_4^{2-}+{\mathrm{H}}^{+}⟶{\mathrm{Mn}}^{2+}+{\mathrm{CO}}_2+{\mathrm{H}}_2\mathrm{O}$, 
the correct whole number stoichiometric coefficients of ${\mathrm{MnO}}_4^{-}, {\mathrm{C}}_2{\mathrm{O}}_4^{2-}$ and ${\mathrm{H}}^{+}$, respectively are

${\mathrm{CN}}^{-}$ is oxidised by ${\mathrm{NO}}_3^{-}$ in presence of acid:
${\mathrm{aCN}}^{-}+{\mathrm{bNO}}_3^{-}+{\mathrm{cH}}^{+}⟶(\mathrm{a}+\mathrm{b})\mathrm{NO}+{\mathrm{aCO}}_2+\frac{\mathrm{C}}{2}{\mathrm{H}}_2\mathrm{O}$
What are the whole number values of $\mathrm{a}, \mathrm{b}, \mathrm{c}$ in that order: