Which metal is electro-deposited on iron surface to prevent rusting

Options

A. Cu
B. Zn
C. Mg
D. Pb

Answer

To answer the question regarding which metal is electro-deposited on iron surfaces to prevent rusting, we can follow these steps:

### Step 1: Understand the Problem
The question asks which metal is used in the electro-deposition process to protect iron from rusting. Rusting is a common issue with iron, leading to corrosion.

**Hint:** Consider the process of galvanization, which is a common method used to prevent rusting.

### Step 2: Identify the Process
The process of electro-deposition used for protecting iron is known as galvanization. This involves coating the iron surface with a protective layer of another metal.

**Hint:** Think about metals that are commonly used for galvanization and their properties.

### Step 3: Determine the Metal Used
The most commonly used metal for galvanization is zinc. Zinc is preferred because it is more reactive than iron, which means it will corrode first, protecting the iron underneath.

**Hint:** Recall that the sacrificial anode principle is at play here; the more reactive metal will corrode instead of the less reactive metal.

### Step 4: Evaluate the Options
The options provided are:
1. Copper
2. Zinc
3. Magnesium
4. Lead

From our understanding, zinc is the metal that is electro-deposited on iron to prevent rusting.

**Hint:** Eliminate the other options based on their reactivity and common usage in rust prevention.

### Step 5: Conclusion
The correct answer to the question is **Zinc** (Option 2). It is the metal that is electro-deposited on iron surfaces to prevent rusting through the process of galvanization.

**Final Answer:** Zinc