Name a gas (other than hydrogen chloride gas) which gives dense white fumes with ammonia.

Explanation

To solve the question, we need to identify a gas that reacts with ammonia (NH₃) to produce dense white fumes, excluding hydrogen chloride (HCl) gas.

### Step-by-Step Solution:

1. **Understanding the Reaction**:
Ammonia (NH₃) can react with certain gases to form solid products. The dense white fumes are typically due to the formation of an ammonium salt.

2. **Identifying the Gases**:
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