Identify the gas evolved in each of the cases:
Dilute hydrochloric acid is added to Zinc sulphide.

Explanation

To identify the gas evolved when dilute hydrochloric acid is added to zinc sulfide, we can follow these steps:

### Step 1: Write the chemical reaction
When dilute hydrochloric acid (HCl) is added to zinc sulfide (ZnS), a chemical reaction occurs. The reaction can be represented as:
\[ \text{ZnS} + 2 \text{HCl} \rightarrow \text{ZnCl}_2 + \text{H}_2\text{S} \]

### Step 2: Identify the products
From the reaction, we can see that zinc chloride (ZnCl₂) is formed as an aqueous salt, and hydrogen sulfide (H₂S) gas is released.
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