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JAMB Chemistry 2012 Question 23

Question 23

Redox Reactions

The oxidation number of boron in NaBH4 is

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

Answer: D (+3)

Explanation

Na is +1 and each H (a hydride) is −1: 1 + x − 4 = 0, so x = +3.