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Question

Which of the following metal is protected by a layer of its own oxide?

A
Silver
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B
Sodium
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C
Aluminium
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D
Iron
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Solution

The correct option is C Aluminium
Aluminium is reactive and reacts spontaneously with water or air to form aluminium oxide (Al2O3), forms a stable passive layer which protects aluminium from corrosion or further oxidation.

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