Questions

In the following reactions, identify the species oxidised, the species reduced, the oxidising agent and reducing agent.

$4\mathrm{HCl}+{\mathrm{MnO}}_2\to {\mathrm{MnCl}}_2+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{Cl}}_2$

In the following reaction, identify the species oxidised, the species reduced, the oxidising agent and reducing agent.

${\mathrm{SnCl}}_2+2{\mathrm{FeCl}}_3\to {\mathrm{SnCl}}_4+2{\mathrm{FeCl}}_2$

In the following reactions, identify the species oxidised, the species reduced, the oxidising agent and reducing agent.

$2{\mathrm{H}}^{+}+\mathrm{Mg}\to {\mathrm{Mg}}^{2+}+{\mathrm{H}}_2$

Explain why ${\mathrm{HNO}}_3$ acts only as an oxidising agent while ${\mathrm{HNO}}_2$ can act both as a reducing agent and as an oxidising agent?

Which one of the following is a redox reactions ?

In which of the following compounds, sulphur has the highest oxidation state?

${\mathrm{SO}}_2, {\mathrm{H}}_2{\mathrm{SO}}_4, {\mathrm{Na}}_2{\mathrm{S}}_2{\mathrm{O}}_3 \mathrm{and} {\mathrm{Na}}_2{\mathrm{S}}_4{\mathrm{O}}_6$.

Calculate oxidation number of oxygen in ${\mathrm{OF}}_2$.

Calculate oxidation state of nitrogen in each of the following compounds.

${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_5\mathrm{Cl}\right]}^{2+}, {\mathrm{NH}}_4\mathrm{OH}, {\left({\mathrm{N}}_2{\mathrm{H}}_5\right)}_2{\mathrm{SO}}_4 \mathrm{and} {\mathrm{Mg}}_3{\mathrm{N}}_2$.