Chemistryhard · Past Paper
What is the oxidation number of Cr in K2Cr2O7?
A+3
B+5
C+6
D+7
✓ Correct Answer: C — +6
2(+1) + 2(Cr) + 7(-2) = 0 => 2Cr = 12 => Cr = +6.
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✓ Correct Answer: C — +6
2(+1) + 2(Cr) + 7(-2) = 0 => 2Cr = 12 => Cr = +6.
Share this question