Which of the following is wrongly matched

Options

A. German silver `Cu+Zn+Ni`
B. Alnico `Fe+Al+Ni+Co`
C. Monel metal `Cu+Zn+zn`
D. Duralumin `Al+Cu+Mg+Mn`

Answer

To determine which of the following options is wrongly matched, we will analyze each option provided in the question regarding their composition.

### Step-by-Step Solution:

1. **Identify the Components of Each Alloy:**
- **German Silver:** This alloy typically consists of copper, nickel, and zinc. The common composition is approximately 60% copper, 20% nickel, and 20% zinc.
- **Alnico:** This is an alloy made of aluminum, nickel, cobalt, and iron. It is correctly stated in the options.
- **Monel Metal:** This alloy primarily consists of nickel (about 66%) and copper (about 31.5%), along with small amounts of other metals such as iron, manganese, carbon, and silicon.
- **Aluminum Alloys:** These can include various metals, but a common composition includes aluminum, copper, and magnesium.

2. **Check Each Option Against Known Compositions:**
- **Option 1 (German Silver):** Correctly matched with copper, nickel, and zinc.
- **Option 2 (Alnico):** Correctly matched with aluminum, nickel, cobalt, and iron.
- **Option 3 (Monel Metal):** The composition mentioned is incorrect as it states copper and zinc, while it primarily consists of nickel and copper.
- **Option 4 (Aluminum Alloys):** This is generally correct as it can include aluminum, copper, and magnesium.

3. **Conclusion:**
- The option that is wrongly matched is **Option 3 (Monel Metal)** because it does not accurately represent the primary components of Monel Metal.

### Final Answer:
The wrongly matched option is **Option 3 (Monel Metal)**.

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