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Question

In the following reactions, identify the species oxidised, the species reduced, the oxidising agent and the reducing agent.
SnCl2+2FeCl3SnCl4+2FeCl2.

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Solution

SnCl2+2FeCl3=SnCl4+2FeCl2
Writing the oxidation numbers on various atoms,
+2Sn1Cl2++32Fe1Cl3=+4Sn1Cl4++22Fe1Cl2
Ox. no. of Sn changes from +2 to +4, i.e., increase in oxidation number. SnCl2 is thus oxidised or it acts as a reducing agent.
Ox. no. of Fe changes from +3 to +2, i.e., decrease in oxidation number. FeCl3 is thus reduced or it acts as an oxidising agent.

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