in the reaction:
Cl2 + 2HBr ----> 2HCl + Br2
identify the reduced specie
To identify the reduced species in a chemical reaction, you need to compare the oxidation states of the species before and after the reaction.
In the given reaction:
Cl2 + 2HBr ----> 2HCl + Br2
The oxidation state of chlorine (Cl) in Cl2 is 0 because it is in its elemental form. In HCl, the oxidation state of chlorine is -1. Therefore, chlorine has been reduced from an oxidation state of 0 to -1.
The oxidation state of bromine (Br) in HBr is -1. In Br2, the oxidation state of bromine is 0. Therefore, bromine has been oxidized from an oxidation state of -1 to 0.
So, in this reaction, chlorine (Cl) is the reduced species because its oxidation state decreases from 0 to -1.