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What is the oxidation number of chromium in K2CrO4?

Chemistry
WAEC 2007
What is the oxidation number of chromium in K2CrO4?
  • A. +1
  • B. +2
  • C. +4
  • D. +6
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Correct Answer: Option D
Explanation
K2CrO4 (O.N of K) X 2 + O.N of Cr + (O.N of oxygen) X 4 = 0
1 X 2 + X + -2 X 4 = 0
2 + x + -8 = 0
2 + x - 8 = 0
x = 8 - 2 = + 6
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