Which is wrongly mached

Options

A. Gun metal-`Cu+ Zn +Sn`
B. Duralumin `-Cu +Al +Mn`
C. German silver-`Cu +Zn +Ni`
D. Electron-`Pb +Sn`

Answer

To determine which option is wrongly matched, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Identify Gunmetal**:
- Gunmetal is also known as Red Brass.
- It is an alloy consisting of copper, tin, zinc, and lead.
- The option states it is made of copper, zinc, and tin, which is correct, as lead is often included in smaller amounts.

2. **Identify Duralumin**:
- Duralumin is an alloy primarily made of aluminum, with copper, magnesium, and manganese.
- The option states it is made of copper, aluminum, and manganese, which is partially correct, but it omits magnesium. However, since the question asks for the wrongly matched option, we will consider this as correct for now since it includes the primary components.

3. **Identify German Silver**:
- German silver is an alloy consisting of copper, nickel, and zinc.
- The option states it is made of copper, zinc, and nickel, which is correct as it lists the same components.

4. **Identify Electron (Pb + Sn)**:
- The last option refers to the alloy formed by melting lead (Pb) and tin (Sn).
- The option states it is made by electron transfer, which is incorrect. The correct method is simply melting the two metals together, not through any electron transfer process.

### Conclusion:
The wrongly matched option is **option 4: Pb + Sn**, as it incorrectly describes the method of formation.