When acidified potassium dichromate is treated with hydrogen peroxide () in an organic ethereal medi — d and f Block Elements Chemistry Question
Question
When acidified potassium dichromate is treated with hydrogen peroxide ($H_2O_2$) in an organic ethereal medium, a highly unstable, intensely deep blue complex is temporarily formed. What is the spatial geometry and the exact oxidation state of Chromium in this complex?
Answer: C
💡 Solution & Explanation
The reaction yields Chromium(VI) peroxide ($CrO_5$). It features a distinct "butterfly" geometry with one $Cr=O$ double bond (oxo oxygen, $-2$) and two peroxy linkages (four oxygens at $-1$ each). The calculation $x + 4(-1) + 1(-2) = 0$ perfectly confirms Chromium is in the $+6$ state.
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