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Q8. Balance the following equation by ion-electron method in basic

                    medium.


                             -      -                   -
                    (i)MnO4  + Br  → MnO2 + BrO3

                                        2-
                               -
                    (ii) MnO4  + S2O3  → MnO2 + SO4
                                                            2-
                    Q9. Balance the following equation by oxidation number method in
                    acidic medium.


                              -       -        2+        -
                    (i) MnO4  + NO2  → Mn  + NO3

                                           3+
                    (ii) Cr2O7  + I  → Cr  + I2
                              2-
                                   -
                    Q10. Balance the following equation by oxidation number method in
                    basic medium.


                           -   -
                    MnO4  + I  → MnO2 + I2
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