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JAMB Chemistry 2009 Question 22

Question 22

Redox Reactions

The oxidation state of Cr in K2Cr2O7 is

  1. A.+7
  2. B.+6
  3. C.+5
  4. D.4
Show the answer and explanation

Answer: B (+6)

Explanation

2(+1) + 2x + 7(−2) = 0, so 2x = 12 and x = +6.