Zinc metal is not a constituent in the alloy

Options

A. Brass
B. Bronze
C. Gun metal
D. Devarda's alloy

Answer

To determine which alloy does not contain zinc as a constituent, we will analyze the composition of each alloy mentioned in the question.

### Step-by-Step Solution:

1. **Identify the Alloys**: The question provides four options: Brass, Bronze, Gunmetal, and an unspecified alloy that includes aluminum.

2. **Analyze Brass**:
- Composition: Brass is made up of approximately 66% copper and 34% zinc.
- Conclusion: Brass contains zinc.

3. **Analyze Bronze**:
- Composition: Bronze is primarily composed of copper and tin. It typically does not contain zinc.
- Conclusion: Bronze does not contain zinc.

4. **Analyze Gunmetal**:
- Composition: Gunmetal is composed of approximately 88% copper, 10% tin, and about 2% zinc.
- Conclusion: Gunmetal contains zinc.

5. **Analyze the Alloy with Aluminum**:
- Composition: This alloy contains aluminum (44-46%), copper (49-51%), and zinc (4-6%).
- Conclusion: This alloy also contains zinc.

6. **Final Conclusion**:
- Among the alloys analyzed, only **Bronze** does not contain zinc as a constituent.

### Final Answer:
Zinc metal is not a constituent in the alloy **Bronze**.