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Anodising is a process of forming a thick oxide layer of aluminium. Aluminium develops a thin oxide layer when exposed to air. This aluminium oxide coat makes it resistant to further corrosion. The resistance can be improved further by making the oxide layer thicker. During anodising, a clean aluminium article is made the anode and is electrolysed with dilute sulphuric acid. The oxygen gas evolved at the anode reacts with aluminium to make a thicker protective oxide layer. This oxide layer can be dyed easily to give aluminium articles an attractive finish.

1. Aluminium develops a thin oxide layer when

a. Exposed to water

b. Exposed to air

2. Aluminium oxide coat prevents?

a. Corrosion

b. Ionising

3. Resistance of corrosion can be improved by?

a. Making oxide layer

b. Making oxide layer thicker

4. Process of thickening of oxide layer to prevent corrosion is called ______.

a. Anodising

b. Corrosion

5. State true or false :

Oxide layer can be dyed easily to give aluminium articles an attractive finish.

a. TRUE

b. FALSE

1 Answer

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1. b. Exposed to air

2. a. Corrosion

3. b. Making oxide layer thicker

4. a. Anodising

5. a. TRUE

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