Question

Balance the following equation in acidic medium Cr2O7 + Mn ----> Mn + Cr

Answer 1

Answer:

Cr2O72- + 2 H+ + 3 (Mn)2+ → 2 (Cr)3+ + 3 MnO2 + H2O

This is an oxidation-reduction (redox) reaction:

3 MnII - 6 e- → 3 MnIV

(oxidation)

2 CrVI + 6 e- → 2 CrIII

(reduction)

Mn2+ is a reducing agent, Cr2O72- is an oxidizing agent.