Question

Permanganate ion (MnO4^- ) reacts with bromide ion (Br^- ) in basic medium to give manganese dioxide (MnO₂) and bromate ion (BrO^-₃). 

(a) Write the balanced ionic equation for this reaction. 

(b) Identify the oxidising agent and reducing agent in this reaction.

Answer 1

(a) Skeletal ionic equation :

MnO^-₄ + Br^- ⟶ MnO₂ + BrO^-₃

Assigning oxidation numbers:

Calculates the increase and decrease in oxidation number and make them equal:

Balancing ionic changes:

2MnO^-_4 ⁺ Br^- _⟶ 2MnO₂ + BrO₃^- + 2OH^-

Balancing H and O atoms:

2MnO^-_4 ⁺ Br^- + H₂O _^⟶ 2MnO₂ + BrO₃^- + 2OH^-

(b) Oxidising agent - MnO^-₄

Reducing agent - Br

Answer 2

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