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The oxidation number of chromium in potassium dichromate is

1. +6
2. -5
3. -2
4. +2

Correct answer: +6

Solution

In potassium dichromate (K2Cr2O7), the oxidation number of potassium is +1, and oxygen is -2. The total charge of the compound is zero, so solving for chromium gives it an oxidation number of +6.

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