Sonali was having a ball made up of steel. She wanted to prevent it from corrosion. So, she decided some of the methods for the prevention of corrosion. Which of the following method cannot be used for the prevention of corrosion?

By coating it with magnesium metal.

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By coating it with copper metal.

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By coating with oil and grease.

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By coating with paints.

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Solution

The correct option is B
By coating it with copper metal.

Corrosion of a steel can be protected by coating of oil, grease, paint and magnesium metal. Magnesium metal is more reactive than iron. When it is coated on the articles made of steel it sacrifices itself to protect the steel. Whereas copper is less reactive than iron and will not prevent corrosion. Hence option B is correct.

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