Identify the gas evolved in each of the cases:
Dilute nitric acid is added to copper.

Explanation

To identify the gas evolved when dilute nitric acid is added to copper, we can follow these steps:

### Step-by-Step Solution

1. **Identify the Reactants**:
- The reactants in this case are copper (Cu) and dilute nitric acid (HNO3).

2. **Write the Reaction Equation**:
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