Question

What is the reduction half-reaction for the following unbalanced redox equation?

Cr2O2 2- + NH3 + → Cr2O3 + N2

A.



Cr2O3 →Cr2O72-


B.



NH4+ → N2


C.



N2 → NH4+


D.



Cr2O72- →Cr2O3

Answer 1

it is D.

here , in Cr_2O_7^2- Cr in +6 Oxidation state.

in Cr_2O_3 Cr is in +3 oxidation state.

Since there is decrease in the oxidation state, Hence this the reduction half reaction from the system of chemical equations.

Answer 2

@SGTC! Did you follow this ? :)

Answer 3

yes thanks