Which one of the following metals is protected from corrosion by a layer of its own oxide?

Which one of the following metals is protected from corrosion by a layer of its own oxide?
(A) Aluminium
(B) Copper
(C) Silver
(D) Gold

Correct Answer : Option (A) Aluminium

More Questions : You have three aqueous solutions A, B and C as given below : A – Potassium nitrate B – Ammonium chloride C – Sodium carbonate. The ascending order of the pH of these solutions is :

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