Question

The hypothetical cis–chloro–diaquatramminecobalt(III) chloride can be represented as:

• A. \([\mathrm{CoCl(NH_3)_3(H_2O)_2}]Cl_2\)
• B. \([\mathrm{Co(NH_3)_3(H_2O)Cl_3}]\)
• C. \([\mathrm{Co(NH_3)_3(H_2O)_2Cl}]Cl_2\)
• D. [Co(NH₃)₃(H₂O)₂]Cl₃

Hint:

Always balance charge inside and outside coordination sphere.

Answer 1

The Correct Option is C

Step 1: Coordination number of Co(III) is 6.
Step 2: Ligands: 3NH₃ + 2H₂O + 1Cl⁻.
Step 3: Charge balance gives two chloride ions outside the coordination sphere.