Best way to prevent rusting of iron is by

Options

A. makin g iron cathode
B. putting it in saline water
C. both of these
D. none of these

Explanation

To solve the question regarding the best way to prevent rusting of iron, we can follow these steps:

### Step 1: Understand Rusting
Rusting of iron is an electrochemical process where iron reacts with oxygen and moisture to form iron oxide (rust). This process can be accelerated in the presence of salt or saline water.

**Hint:** Remember that rusting requires both moisture and oxygen.

### Step 2: Explore Prevention Methods
There are several methods to prevent rusting, including:
- Coating the iron with paint or oil.
- Galvanization (coating with zinc).
- Using stainless steel.
- Cathodic protection.

**Hint:** Consider methods that involve either physical barriers or electrochemical techniques.

### Step 3: Identify the Best Method
Among the options given, the best method to prevent rusting is **cathodic protection**. This involves making the iron a cathode in an electrochemical cell, typically by attaching it to a more reactive metal (like zinc or magnesium). This sacrificial anode will corrode instead of the iron, thus protecting it from rusting.

**Hint:** Think about how sacrificial anodes work in an electrochemical context.

### Step 4: Conclusion
The correct answer to the question is to make iron a cathode, which effectively prevents rusting by using cathodic protection.

**Hint:** Review the principles of electrochemistry to understand why this method is effective.

### Final Answer
The best way to prevent rusting of iron is by making iron a cathode through cathodic protection.