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JAMB Chemistry 2009 Question 21

Question 21

Redox Reactions

The colour change observed when testing for reducing agents using acidified potassium heptaoxodichromate (VI) solution is

  1. A.yellow to purple
  2. B.orange to green
  3. C.green to orange
  4. D.purple to yellow
Show the answer and explanation

Answer: B (orange to green)

Explanation

A reducing agent turns orange Cr2O72− into green Cr3+.