Question

Arrange the following complexes in the increasing order of conductivity of their solution: \[ [\text{Cr(NH}_3\text{)}_5\text{Cl}] \text{Cl}_2, \, [\text{Cr(NH}_3\text{)}_3\text{Cl}_3], \, [\text{Cr(NH}_3\text{)}_6\text{Cl}_3] \]

Answer 1

The conductivity of a compound in solution depends on the number of ions it dissociates into. The more dissociation, the higher the conductivity.

For the given complexes:

• [Cr(NH₃)₅Cl]Cl₂ dissociates into 2 ions.
• [Cr(NH₃)₃Cl₃] dissociates into 4 ions.
• [Cr(NH₃)₆Cl₃] dissociates into 6 ions.

Thus, the order of conductivity is:

[Cr(NH₃)₃Cl₃] < [Cr(NH₃)₅Cl]Cl₂ < [Cr(NH₃)₆Cl₃]