MCQ
The oxidation number of Cr in K2Cr2O7 is:
Explanation
In K2Cr2O7, 2(+1) + 2x + 7(-2) = 0, solving gives x = +6 for chromium.
In K2Cr2O7, 2(+1) + 2x + 7(-2) = 0, solving gives x = +6 for chromium.