Question

Arrange the following complexes in the increasing order of conductivity of their solution

$\left[Co\right(N{H}_3{)}_{3}C{l}_3],[Co\left(N{H}_3{)}_{4}C{l}_2\right]Cl,\left[Co\right(N{H}_3{)}_6]C{l}_3,[Co\left(N{H}_3{)}_{5}Cl\right]C{l}_2$

Answer 1

Ions are molecules present outside the coordination sphere are ionisable. A complex which gives more ions on dissolution is more conducting.

$\begin{array}{ccccccc}\left[Co\right(N{H}_3{)}_{3}C{l}_3]& <& \left[Co\right(N{H}_3{)}_{4}C{l}_2]Cl& <& \left[Co\right(N{H}_3{)}_{5}Cl]C{l}_2& <& \left[Co\right(N{H}_3{)}_6]C{l}_3\\ \left(1ion\right)& & \left(2ions\right)& & \left(3ions\right)& & \left(4ions\right)\end{array}$

Here, the number of ions increases and conductivity increases.