Give an example of displacement reaction.

Identify the substance that is oxidised and reduced in the following reaction-

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

What do you mean by Redox reaction ? Identify the substances that are oxidised and reduced in the following reaction- 

$\mathrm{ZnO} + \mathrm{C} \stackrel{ }{\to } \mathrm{Zn} + \mathrm{CO}$

Give balanced chemical equation for following reaction-

${\mathrm{Fe}}_2{\mathrm{O}}_3 + 2\mathrm{Al} \stackrel{ }{\to } {\mathrm{Al}}_2{\mathrm{O}}_3 + \mathrm{Fe}$