d
d
When excess of \(AgNO_3\) and \(BaCl_2\) are added to solution \(X\).

\(\underset{\begin{smallmatrix} 
 1\,\,mole \\ 
 0.02\,\,mole 
\end{smallmatrix}}{\mathop{[Co{{(N{{H}_{3}})}_{5}}Br]C{{l}_{2}}}}\,\,+\,\underset{2\,\,moles}{\mathop{2AgN{{O}_{3}}}}\,\,\to \) \(\underset{1\,\,mole}{\mathop{[Co{{(N{{H}_{3}})}_{5}}Br]{{(N{{O}_{3}})}_{2}}}}\,+\underset{\begin{smallmatrix} 
 2\,\,moles \\ 
 0.02\,\times 2\,=\,0.04\,mole 
\end{smallmatrix}}{\mathop{2AgCl}}\,\,(ppt.)(Y)\)

\(\underset{\begin{smallmatrix} 
 1\,\,mole \\ 
 0.02\,\,mole 
\end{smallmatrix}}{\mathop{[Co{{(N{{H}_{3}})}_{5}}Cl]S{{O}_{4}}\,}}\,+\,BaC{{l}_{2}}\,\to \) \([Co{{(N{{H}_{3}})}_{5}}Cl]C{{l}_{2}}+\,\underset{\begin{smallmatrix} 
 \,\,\,\,\,\,\,1\,\,moles \\ 
 0.02\,\,mole 
\end{smallmatrix}}{\mathop{BaS{{O}_{4}}}}\,\,(ppt.)(Z)\)