Exposed iron reacts with oxygen and moisture in the environment, forming iron oxide, commonly known as rust. This corrosion weakens the metal, leading to degradation and loss of structural integrity.
Equal sized bars of aluminium and iron are exposed to the environment as shown below. Which of them is likely to corrode till the level marked by the line FIRST? Justify your answer.
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1. The iron bar will erode till the level set apart by the line first.
2. Iron gets oxidized on openness to air and dampness. The layer of rust framed on a superficial level permits air and dampness to go through and arrive at the metal, making erosion proceed.
3. Aluminum gets oxidized on openness to air. The layer of oxide framed on a superficial level structures a defensive covering that keeps air from arriving at the metal and consequently forestalls further erosion.