Question

Determine the coordination number and the oxidation state of the transition metal ion in each of the following complex:
(a) [Co(NH3)6]3+ (b) [CuCl4]2-, (c) [Cu(NH3)4]Cl2, (d) K2[PtCl6]

10 Jan 2026
Answer :
Word Count : 247
In the complex [Co(NH3)6]³⁺, the cobalt ion is surrounded by six ammonia ligands, which are neutral. Therefore, the coordination number of cobalt is 6. Since the overall charge of the complex is +3 and ammonia is neutral, the oxidation state of cobalt must be +3. In [CuCl4]²⁻, the copper ion is bonded to four chloride ions. Chloride is a monodentate ligand with a -1 charge. The total negative charge from four chloride ions is -4, and the overall complex charge is -2. To balance this, the oxidation state of copper must be +2. The
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