Since conductance measurements show two ions per formula unit, all the ammonia ligands are present in the coordination sphere. Hence, the structural formula is $\left[ CoBr _{2}\left( NH _{3}\right)_{4}\right] Cl$
$ {\left[ CoBr _{2}\left( NH _{3}\right)_{4}\right] Cl + AgNO _{3} \rightleftharpoons\left[ CoBr _{2}\left( NH _{3}\right)_{4}\right]+ NO _{3}^{-}+ AgCl }$
${\left[ CoBr _{2}\left( NH _{3}\right)_{4}\right] Cl\rightleftharpoons\left[ CoBr _{2}\left( NH _{3}\right)_{4}\right]+Cl ^{-}}$
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$Ag(s)\,\,|\,\,A{g_2}{C_2}{O_4}(s)\,\,|\,\,{C_2}O_4^{2 - }(0.02\,M)\,\,||\,\,A{g^ + }(0.5\,M)\,\,|\,\,Ag(s)$
$EMF$ of cell is $0.264\ V$ at $25\,^oC$ . $K_{sp}$ of $Ag_2C_2O_4(s)$ is
$\left[ {Given = \frac{{2.303 \times 8.314 \times 298}}{{96500}} = \frac{{2.303RT}}{F} = 0.06,\,\log 2 = 0.3} \right]$
