Which of the following is not correct for alloys

Options

A. Germa silver - Cu,Zn,Ni
B. Brass- Cu,Zn,Ni
C. Bronze- Cu,Sn
D. Bell Metal-Cu,Sn

Answer

To solve the question of which statement about alloys is not correct, we need to analyze each statement provided regarding the composition of the mentioned alloys.

### Step-by-Step Solution:

1. **Understanding Alloys**: An alloy is a mixture of two or more metals or a metal and a non-metal. Common examples include brass, bronze, and German silver.

2. **Analyzing Each Statement**:
- **Statement 1**: "German silver is made up of copper, zinc, and nickel."
- **Analysis**: This statement is correct. German silver typically consists of about 50-60% copper, 17-19% zinc, and 20-30% nickel.

- **Statement 2**: "Brass is made up of copper, zinc, and nickel."
- **Analysis**: This statement is incorrect. Brass is primarily an alloy of copper and zinc, without nickel.

- **Statement 3**: "Bronze is made up of copper and tin."
- **Analysis**: This statement is correct. Bronze is indeed an alloy of copper and tin, usually containing 75-90% copper and 10-25% tin.

- **Statement 4**: "Bell metal is made up of copper and tin."
- **Analysis**: This statement is also correct. Bell metal is a type of bronze that contains a higher percentage of tin, typically around 80% copper and 20% tin.

3. **Conclusion**: Based on the analysis, the statement that is not correct is **Statement 2**, which claims that brass is made up of copper, zinc, and nickel.

### Final Answer:
The statement that is not correct for alloys is **Statement 2**: "Brass is made up of copper, zinc, and nickel."

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