ChemistryOxidation and reductionJAMB
Find the oxidation number of chromium in K₂Cr₂O₇.
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Answer: B. +6
2(+1) + 2Cr + 7(−2) = 0 gives 2Cr = 12, so Cr = +6.
An AdmitMe practice question, written for the JAMB syllabus. Not an official past question.