Q.

Which metal forms a protective oxide layer to prevent corrosion ?

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a

Ag

b

Au

c

Cu

d

Al

answer is C.

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Detailed Solution

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This is because aluminium develops a thin oxide layer on the surface when the metal comes in contact with oxygen. The oxide layer protects the aluminium against corrosion and if it is damaged, it will immediately regenerate, provided there is oxygen present.

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