A gas evolved with effervescence on treating a salt with dil. HCl may be `CO_(2)` or `SO_(3)`. How will you distinguish between them?

Explanation

To distinguish between the gases evolved (either \( CO_2 \) or \( SO_2 \)) when a salt is treated with dilute HCl, we can follow these steps:

### Step 1: Observe the Odor
- **Procedure**: Carefully smell the gas evolved from the reaction.
- **Observation**:
- If the gas has a pungent, burning sulfur smell, it is likely \( SO_2 \).
- If the gas is odorless, it is likely \( CO_2 \).

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