JEE Main 2003 — Coordination Compounds Question with Solution

The complex compound Co(NH₃)₅Cl₃ dissociates in water to form three moles of ions. This dissociation can be represented as:

$${\text{Co(NH}}_3{\text{)}}_5{\text{Cl}}_3\leftrightharpoons {\left[{\text{Co(NH}}_3{\text{)}}_5\text{Cl}\right]}^{+2}+2{\text{Cl}}^{-}$$

Therefore, the structure of the complex is:

$$\left[{\text{Co(NH}}_3{\text{)}}_5\text{Cl}\right]{\text{Cl}}_2$$

When this complex reacts with two moles of AgNO₃ solution, it produces:

$$\left[{\text{Co(NH}}_3{\text{)}}_5\text{Cl}\right]{\text{Cl}}_2+2{\text{AgNO}}_3\to \left[{\text{Co(NH}}_3{\text{)}}_5\text{Cl}\right]({\text{NO}}_3{)}_2+2\text{AgCl}$$

This reaction yields two moles of AgCl, confirming the complex structure as:

$$\left[{\text{Co(NH}}_3{\text{)}}_5\text{Cl}\right]{\text{Cl}}_2$$