JEE Advanced Chemistry question
SO2 reduces Cr2O7²⁻ to Cr3+. The (total) change in oxidation number of Cr (per mole of dichromate) is .
Answer: 6
Solution
In the half-reaction Cr2O72− + 14H+ + 6e− → 2Cr3+ + 7H2O, each of the two chromium atoms goes from +6 to +3, a 3-electron change per Cr atom; across both Cr
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