The oxidation state of Chromium (Cr) in is: — Redox Reactions and Volumetric Analysis Chemistry Question

💡 Solution & Explanation

$CrO_5$ has a butterfly-like structure containing two peroxide linkages (4 oxygen atoms with -1 oxidation state) and one double-bonded oxide (1 oxygen atom with -2 oxidation state). Let the O.S. of Cr be x. Then, $x + 4(-1) + 1(-2) = 0 \Rightarrow x = +6$ . Mathematically calculating +10 violates the maximum group valency of +6.