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Out of the following complex compounds, which of the compound will be having the minimum conductance in solution?
A
$[\text{Co(NH}_3)_3\text{Cl}_3]$
B
$[\text{Co(NH}_3)_4\text{Cl}_2]\text{Cl}$
C
$[\text{Co(NH}_3)_6]\text{Cl}_3$
D
$[\text{Co(NH}_3)_5\text{Cl}]\text{Cl}_2$
Explanation
$[\text{Co(NH}_3)_3\text{Cl}_3]$ is a neutral coordination complex that does not ionize in water, giving minimum electrical conductance.
Detailed Solution
Electrical conductance in aqueous solution is directly proportional to the number of free ions produced per formula unit. $[\text{Co(NH}_3)_6]\text{Cl}_3$ produces 4 ions; $[\text{Co(NH}_3)_5\text{Cl}]\text{Cl}_2$ produces 3 ions; $[\text{Co(NH}_3)_4\text{Cl}_2]\text{Cl}$ produces 2 ions. $[\text{Co(NH}_3)_3\text{Cl}_3]$ is a neutral non-electrolyte complex that does not dissociate into ions in water, exhibiting minimum (near zero) electrical conductance.