What volume of `0.2` M `K_2Cr_2O_7` is required to oxidise 50 " mL of " `0.3 M` `Na_2C_2O_4` in acidic medium?

Explanation

To solve the problem of determining the volume of `0.2 M K_2Cr_2O_7` required to oxidize `50 mL` of `0.3 M Na_2C_2O_4` in acidic medium, we will follow these steps:

### Step 1: Write the balanced half-reactions
1. **Oxidation of Oxalate Ion (C2O4^2-)**:
\[ C_2O_4^{2-} \rightarrow 2CO_2 + 2e^- \]
Here, the oxalate ion is oxidized to carbon dioxide, releasing 2 electrons.
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