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 determine which of the following is not correct for alloys, let's analyze the given options one by one.

### Step 1: Understand what an alloy is
An alloy is a mixture of two or more metals, or a metal and a non-metal, that has metallic properties. Common examples include bronze, brass, and German silver.

### Step 2: Analyze each option
1. **Bronze**: Bronze is an alloy primarily made of copper (60-80%) and tin (10-40%). This is a correct description of bronze.

2. **Brass**: Brass is an alloy made of copper (60-80%) and zinc (20-40%). The mention of nickel in the context of brass is incorrect, as brass does not typically contain nickel. Therefore, this option is likely the incorrect one.

3. **Bell Metal**: Bell metal is an alloy of copper and tin, usually containing about 80% copper and 20% tin. This is a correct description.

4. **German Silver**: German silver is an alloy made of copper (50-62%), zinc (17-19%), and nickel (21-30%). This is also a correct description.

### Step 3: Conclusion
Based on the analysis, the option that is not correct for alloys is **Brass**, as it incorrectly includes nickel in its composition.

### Final Answer
The answer is **Brass**.

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