Seema Saini Solutions for Chapter: Redox Reactions, Exercise 2: DPP 2.2

In balancing the half-reaction,

${\mathrm{CN}}^{-}⟶{\mathrm{CNO}}^{-}$ (skeletal) 

the number of electrons that must be added are:

In the following reaction (unbalanced), equivalent weight of ${\mathrm{As}}_2{\mathrm{S}}_3$ is related to molecular weight $\mathrm{M}$ by,

${\mathrm{As}}_2{\mathrm{S}}_3+{\mathrm{H}}^{+}+{\mathrm{NO}}_3^{-}⟶\mathrm{NO}+{\mathrm{H}}_2\mathrm{O}+{\mathrm{AsO}}_4^{3-}+{\mathrm{SO}}_4^{2-}$

In the following unbalanced redox reaction,

${\mathrm{Cu}}_3\mathrm{P}+{\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}⟶{\mathrm{Cu}}^{2+}+{\mathrm{H}}_3{\mathrm{PO}}_4+{\mathrm{Cr}}^{3+}$

The equivalent weight of ${\mathrm{H}}_3{\mathrm{PO}}_4$ is:

Select the correct statements.

Equivalent weight of ${\mathrm{KMnO}}_4(\mathrm{molar} \mathrm{mass} =\mathrm{M})$ is

Select the correct statement(s).

Consider the following reaction,
${\mathrm{Br}}_2+{\mathrm{OH}}^{-}⟶{\mathrm{BrO}}_3^{-}+{\mathrm{Br}}^{-}+{\mathrm{H}}_2\mathrm{O}$ (unbalanced)

Select the correct statement.

Which is correct about tailing of $\mathrm{Hg}$?

For the reaction:
${\mathrm{I}}^{-}+{\mathrm{ClO}}_3^{-}+{\mathrm{H}}_2{\mathrm{SO}}_4⟶{\mathrm{Cl}}^{-}+{\mathrm{HSO}}_4^{-}+{\mathrm{I}}_2$

The correct statement(s) in the balanced equation is/are: