5. Co-ordination chemistry — Chemistry STD 12 Science — Question

$I_2 + 2e^-\to 2I^-$  ;     $E^o = 0.54 \,V$

$MnO_4^-+ 8H^+ + 5e^-\to  Mn^{2+} + 4H_2O$  ;  $E^o = 1.52\, V$

$Fe^{3+} + e^-\to Fe^{2+}$ ;     $E^o = 0.77\, V$

$Sn^{4+} + 2e^-\to Sn^{2+}$ ;    $E^o = 0.1\, V$
The strongest reducant and oxidant respectively are :

$C{l_2} + 2B{r^ - }\left( {aq} \right) \to 2C{l^ - }\left( {aq} \right) + B{r_2}$

$Br_2$ gas thus formed is dissolved into solution of $Na_2CO_3$ and then pure $Br_2$ is obtained by treatment of the solution with