Multiple choice

What is the oxidation number of Cr in CrO4–2 ion?

    • 1
    • 2
    • 4
    • 6
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D Correct answer
Explanation

In the chromate ion (CrO4^2-), oxygen has an oxidation number of -2. Since there are 4 oxygen atoms contributing -8 total and the ion has a -2 charge, the chromium must be +6 to balance: +6 + (-8) = -2.

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