What is the oxidation number of chromium in Cr[(NH₃)₄Cl₂]Cl? A)-3 B)+3 C)+2 D)-2 E)0

Question

Quizplus · Accepted Answer

The complex is Cr[(NH3)5Cl]Cl. In this complex, NH3 is a neutral ligand and does not contribute to the oxidation state of chromium. Cl inside the coordination sphere contributes -1, and the Cl outside the coordination sphere does not affect the oxidation state of Cr. Thus, to balance the charge, Cr must have an oxidation state of +3.

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What Is the Oxidation Number of Chromium in Cr[(NH₃)₄Cl₂]Cl