Question

Balance the following redox reaction by inserting the appropriate coefficients. H^+ +CrO4^2- +NO 2^- =Cr^3+ +H2O+NO3^-

Answer 1

http://www.chemteam.info/Redox/Redox.html

Hint: Cr is +6 on the left and +3 on the right. N is +2 on the left and +5 on the right.