NEET Chemistry Oxidation Number MCQ Question
In the reduction half-reaction of Cr2O7 2– to Cr3+ in an acidic medium, how many electrons are transferred when 1 mol of Cr2O7 2– is completely reduced?
6 electrons
2 electrons
4 electrons
8 electrons
Correct Answer
Detailed Explanation
From the balanced equation: Cr2O7 2– + 14H+ + 6e– → 2Cr3+ + 7H2O, it is clear that 6 electrons are transferred for the reduction of 1 mol of Cr2O7 2– to 2 mol of Cr3+.
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