Name the substance oxidised and the substance reduced, and also identify the oxidising agent and reducing agents in the following reactions : (a) 3MnO_(2) +4Al to 3Mn +2Al_(2)O_(3) (b) Fe_(2)O_(3) + 3CO to 2Fe + 3CO_(2) (c) SO_(2) + 2H_(2)S to 3S +2H_(2)O

Name the substance oxidised and the substance reduced, and also identi

1.	Name the substance oxidised and the substance reduced, and also identify the oxidising agent and reducing agents in the following reactions : (a) 3MnO_(2) +4Al to 3Mn +2Al_(2)O_(3) (b) Fe_(2)O_(3) + 3CO to 2Fe + 3CO_(2) (c) SO_(2) + 2H_(2)S to 3S +2H_(2)O
Answer» Solution :Writing the oxidation numbers of all atoms involved in the given REACTION, we have From the above it is clear that the oxidation number of Al increases from 0 to +3. Hence, Al UNDERGOES oxidation and acts as a reducing agent. In `MnO_(2)`, the oxidation number of Mn decreases from +4 to 0. Therefore, `MnO_(2)` undergoes reduction and acts as an OXIDISING agent.