Of the following complex ions,two appear violet in aqueous solution,one appears purple,one appears blue-green,and one appears yellow.Which is yellow? A)[Cr(H₂O)₆]³⁺ B)[CrCl(H₂O)₅]²⁺ C)[CrCl(NH₃)₅]²⁺ D)[CrCl₂(NH₃)₄]⁺ E)[Cr(NH₃)₆]³⁺

Question

Quizplus · Accepted Answer

The complex ion [Cr(NH3)6]3+ is known as chromium(III) hexaammine and appears violet in aqueous solution. Therefore, E, which contains this ion, cannot be the answer. The other four complex ions contain Cr(III) and different ligands. Of these, A, B, and C contain sulfur-containing ligands and may therefore appear purple or blue-green due to ligand field effects. D contains a combination of a sulfur-containing ligand and an amine ligand, and may also appear purple or blue-green. The only complex ion that is not likely to appear violet, purple, or blue-green is E, which contains only amine ligands, and is therefore the answer.

Of the Following Complex Ions,two Appear Violet in Aqueous Solution,one