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JAMB Chemistry 1989 Question 24

Question 24

Redox Reactions

An element, Z forms an anion whose formula is [Z(CN)6]y. If Z has an oxidation number of +2, what is the value of y?

  1. A.−2
  2. B.−3
  3. C.−4
  4. D.−5
Show the answer and explanation

Answer: C (−4)

Explanation

Each CN− contributes −1, so y = +2 + 6(−1) = −4.