Which of the following species have at least one element in an oxidation state of +6? — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

**(A)** $Cr$ is +6 (with 4 peroxide oxygens). <br>**(B)** $S$ is +6 (with 1 peroxide linkage). <br>**(C)** $Cr$ is +6. <br>**(D)** $Mn$ is +7.