__________ is used to coat iron objects such as taps, rims of wheels, parts of cars and bicycles.

Options

A. Nickel
B. Chromium
C. Zinc
D. Lead

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for a specific metal that is used to coat iron objects, such as taps, rims of wheels, and parts of cars and bicycles.

2. **Identifying the Purpose of Coating**: Coating is done to protect metal objects from corrosion and rust. This is important for maintaining the longevity and appearance of the items.

3. **Defining Electroplating**: The process of coating one metal with another is known as electroplating. This technique is commonly used to enhance the properties of the base metal.

4. **Evaluating the Options**: The options provided are Nickel, Chromium, and Zinc. We need to determine which of these metals is typically used for coating iron objects.

5. **Analyzing the Properties of Each Metal**:
- **Nickel**: While nickel can be used in electroplating, it is not the most common choice for the objects mentioned.
- **Zinc**: Zinc is often used for galvanizing iron but is not specifically known for the shiny finish required for taps and rims.
- **Chromium**: Chromium is known for its shiny appearance, resistance to corrosion, and scratch resistance, making it an ideal choice for coating iron objects.

6. **Conclusion**: Based on the analysis, the metal used to coat iron objects such as taps, rims of wheels, and parts of cars and bicycles is **Chromium**.

**Final Answer**: Chromium

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