How will you test for the gas which is liberated when hydrochloric acid reacts with an active metal?

Explanation

To test for the gas liberated when hydrochloric acid reacts with an active metal, follow these steps:

### Step-by-Step Solution:

1. **Identify the Active Metal**: Choose an active metal that is higher than hydrogen in the metal activity series. Examples include zinc, magnesium, or aluminum.

2. **Prepare the Reaction**: In a test tube, add a small amount of hydrochloric acid (HCl) and then introduce the active metal into the acid. The reaction will produce hydrogen gas (H₂) and a salt.

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