In order to preserve food items, iron cans used to store food are coated with a layer of _________.

Options

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

Answer

To solve the question, "In order to preserve food items, iron cans used to store food are coated with a layer of _________," we can follow these steps:

### Step 1: Identify the Material of the Cans
Iron cans are primarily made of iron (Fe). This is the base material used for making food storage cans.

### Step 2: Understand the Purpose of Coating
The purpose of coating the iron cans is to prevent corrosion and rusting. Iron can easily rust when exposed to moisture and air, which can lead to the contamination of food.

### Step 3: Determine the Coating Material
The common material used to coat iron cans is tin. Tin is chosen because it is non-toxic, does not corrode easily, and provides a shiny appearance to the cans.

### Step 4: Recognize the Process of Coating
The process used to coat iron with tin is called electroplating. In electroplating, a layer of one metal is deposited onto another metal using an electric current.

### Step 5: Conclude the Answer
Based on the above information, the correct answer to the question is that iron cans used to store food are coated with a layer of **tin**.

### Final Answer:
In order to preserve food items, iron cans used to store food are coated with a layer of **tin**.

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