What is wrong about the following pair of complex compounds? [Cr(H₂O)₆]Cl₃ and [Cr(H₂O)₅Cl]Cl₂.H₂O
 

[Cr(H₂O)₆]Cl₃ $\stackrel{ }{\to }$[Cr(H₂O)₆]³⁺(aq) +3Cl^-(aq)

In the above reaction, we can observe 4 ions are being released

[Cr(H₂O)₅Cl] Cl₂.H₂O$\stackrel{ }{\to }$[Cr(H₂O)₅Cl]³⁺+ 2Cl^-

In the above reaction, we can observe 3 ions are being released

Thus, from the above observation, we can establish that their aqueous solutions do not have the same molar conductivity. It is different because it gives the number of ions in the solution.

Hence, the correct option is option (C) Their 0.1M aqueous solutions have the same molar conductivity.