Cr2o7-2+no-2=cr3++no-3

Answer 1

Cr2o7-2+no-2=cr3++no-3
1. I assume you mean [Cr2O7]^2- + [NO2]^- ==> Cr^3+ + [NO3]^-
2. I assume you want that balanced.
[Cr2O7]^2- + 3[NO2]^- + 8H^+ ==> 2Cr^3+ + 3[NO3]^- + 4H2O
3. Piece a cake.