AP Chemistrymediummcq1 pt
What is the oxidation state of chromium in K₂Cr₂O₇?
A.+7
B.+6
C.+4
D.+3
Explanation
Core Concept
In K₂Cr₂O₇: K is +1 (×2 = +2), O is -2 (×7 = -14). Total charge = 0, so 2 + 2x - 14 = 0, giving 2x = +12, x = +6.
Correct Answer
B+6
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