Name the substance which gets oxidised, the substance which gets reduced, the oxidising agent and the reducing agent in the following reactions :
`3MnO_(2)+4Al to3Mn+2Al_(2)O_(3)`

Explanation

To solve the problem, we need to analyze the given chemical reaction step by step. The reaction is:

\[ 3 \text{MnO}_2 + 4 \text{Al} \rightarrow 3 \text{Mn} + 2 \text{Al}_2\text{O}_3 \]

### Step 1: Identify the oxidation states of the elements in the reactants and products.

- In \(\text{MnO}_2\), manganese (Mn) has an oxidation state of +4 (since oxygen is -2, and there are two oxygens).
- In \(\text{Al}\), aluminum (Al) has an oxidation state of 0 (elemental state).
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