Which alloy is made up of chromium, nickel and iron?

Options

A. Stainless steel
B. Bronze
C. Solder
D. Brass

Answer

**Step-by-Step Solution:**

1. **Understanding Alloys**: First, we need to understand what an alloy is. An alloy is a homogeneous mixture of two or more metals, and it can also include non-metals.

2. **Identifying the Alloys**: The question asks for an alloy made up of chromium, nickel, and iron. We need to consider common alloys that contain these metals.

3. **Analyzing the Options**:
- **Stainless Steel**: This alloy contains chromium, nickel, iron, and sometimes carbon. It is widely used in kitchenware and cutlery.
- **Bronze**: This alloy is primarily made of copper and tin. It does not contain chromium, nickel, or iron.
- **Solder**: This is an alloy made of lead and tin, which also does not include chromium, nickel, or iron.
- **Brass**: Brass is composed of copper and zinc, and it does not include chromium, nickel, or iron.

4. **Conclusion**: After analyzing the options, we find that the only alloy that contains chromium, nickel, and iron is **stainless steel**.

5. **Final Answer**: The alloy made up of chromium, nickel, and iron is **stainless steel**.

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