Iron nails react with which of the following metal solution?

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

The above reaction is an example of

Give balanced chemical equation for following reaction-

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

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

The type of the above reaction is:

Which of the following reaction does not takes place? State the reason.

(i) ${\mathrm{FeSO}}_4 + \mathrm{Mg} \stackrel{}{\to }{\mathrm{MgSO}}_4 + \mathrm{Fe}$  

(ii) ${\mathrm{ZnSO}}_4 + \mathrm{Cu} \stackrel{}{\to }{\mathrm{CuSO}}_4 + \mathrm{Zn}$ 

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

The above reaction is an example of a

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

The above reaction is an example of a 

Below are given two chemical reactions. Which is combination reaction and which is displacement reaction?

(i) $2\mathrm{KBr}\left(\mathrm{aq}\right)+{\mathrm{Cl}}_2\left(\mathrm{aq}\right)\to 2\mathrm{KCl}\left(\mathrm{aq}\right)+{\mathrm{Br}}_2\left(\mathrm{aq}\right)$

(ii) $\mathrm{Fe}\left(\mathrm{s}\right)+\mathrm{S}\left(\mathrm{s}\right)\to \mathrm{FeS}\left(\mathrm{s}\right)$