Cr in CrO4-2 has oxidation state of +6
Cr in Cr+3 has oxidation state of +3
So, Cr in CrO4-2 is reduced to Cr+3
N in NO2- has oxidation state of +3
N in NO3- has oxidation state of +5
So, N in NO2- is oxidised to NO3-
Reduction half cell:
CrO4-2 + 3e- --> Cr+3
Oxidation half cell:
NO2- --> NO3- + 2e-
Balance number of electrons to be same in both half reactions
Reduction half cell:
2 CrO4-2 + 6e- --> 2 Cr+3
Oxidation half cell:
3 NO2- --> 3 NO3- + 6e-
Lets combine both the reactions.
2 CrO4-2 + 3 NO2- --> 2 Cr+3 + 3 NO3-
Balance Oxygen by adding water
2 CrO4-2 + 3 NO2- --> 2 Cr+3 + 3 NO3- + 5 H2O
Balance Hydrogen by adding H+
2 CrO4-2 + 3 NO2- + 10 H+ --> 2 Cr+3 + 3 NO3- + 5 H2O
This is balanced chemical equation in acidic medium
Answer:
10 H+ + 2 CrO42- + 3 NO2- -> 2 Cr3+ + 5 H2O + 3 NO3-
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