Identifying Oxidizing and Reducing Agents A chemical reaction in which the atoms

Question

Identifying Oxidizing and Reducing Agents

A chemical reaction in which the atoms of the reactants undergo a change in the oxidation state is called a redox reaction. Such reactions involve both oxidation (increase in oxidation state) and reduction (decrease in oxidation state) reactions simultaneously. A reducing agent is the one that reduces another species and at the same time itself gets oxidized. An oxidizing agent is the one that oxidizes another species and at the same time itself gets reduced. So a species whose oxidation state increases is called a reducing agent whereas a species whose oxidation state decreases is called an oxidizing agent.

Part A

For the given reactions, classify the reactants as the reducing agent, oxidizing agent, or neither.

3O2+4Fe?2Fe2O3H2+Br2?2HBr

PLEASE CLASSIFY WHICH ONES ARE EITHER OXIDIZNG AGENT OR REDUCING AGENT (O2, Br2,H2,Fe)

Explanation / Answer

For                      3O2 + 4Fe --> 2Fe2O3

oxidation state      O in O2 =0 .... Fe = 0             In Fe2O3, Fe=+3, O=-2

O2 is oxidising agent

, Fe is reducing agent

b) H2+Br2 ---> 2HBr

oxidation state of H in H2 =0,Br in Br2=0, H in HBr =+1 ,Br in HBr =-1

H2 is reducing agent ,

Br2 is oxidising agent

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