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Earlier discussion
2 older comments kept for context.
Rejoice
In this equation, the oxidation state of Cl changes from 0 to -1, so it is reduced and acts as the oxidizing agent .
Therefore the oxidizing agent in the given equation is Cl2.
Charles Ndika
But Cl2 in that equation is a gas and not an ion. Since it is a reversible reaction, Fe3+ should be the O.A. since it decreased from +3 to +2