The oxidation number of Cr in Cr₂O₇^2- is A) -12. B) -7. C) -2. D) +6. E) +7.

Question

Quizplus · Accepted Answer

The oxidation number of sulfur is usually -2, and oxygen is usually -2 as well. We have 1 sulfur oxide anion (SO4) with a -2 charge, which means we have a total of -8 charge from sulfur and oxygen. The overall charge of the compound is 0, so the total charge of chromium must be +8. Hence the oxidation number of Cr in the given compound is +6.

The Oxidation Number of Cr in Cr2O72- Is

The Oxidation Number of Cr in Cr₂O₇^2- Is