What is the oxidation number of Cr in K₂Cr₂O₇?
Answer and explanation
Correct answer: D. +6
- Step 1: The oxidation numbers in a neutral compound add up to zero (H +1, O -2, K and Na +1).
- Step 2: Setting up the equation for Cr gives +6.
Answer
+6.
Why not the others: +4, +8 and -6 do not fit.
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