What is the primary purpose of anodising aluminium?
To enhance its corrosion resistance and appearance
Aluminium naturally forms a thin oxide layer (Al₂O₃) on its surface that provides some corrosion protection. Anodising is an electrolytic process that thickens this oxide layer artificially, making it much harder, durable, and corrosion-resistant. The porous oxide can also be dyed to give the surface a decorative finish.
Anodising does not make aluminium softer, does not increase its reactivity with acids (the oxide layer actually protects it), and does not improve electrical conductivity.
The correct answer is : To enhance its corrosion resistance and appearance.
Similar Questions
If a piece of aluminium is added to iron(II) sulphate (FeSO4) solution, what will happen?
Balance the following reaction:
\(3\,\text{MnO}_2\,(s) + x\,\text{Al}\,(s) \rightarrow 3\,\text{Mn}\,(l) + y\,\text{Al}_2\text{O}_3\,(s) + \text{Heat}\)
What is the primary chemistry behind a displacement reaction?
What type of ions exchange between reactants in a double displacement reaction?
What is generally produced when a metal reacts with an acid?
Which of the following is a chemical change?
Important Questions from Chemical Reaction
- Which one of the following is not an example of a redox reaction?
- Which one of the following is not a pigment?
- Which one of the following reactions is an example of decomposition reaction?
Match List I with List II and select the correct answer using the code given below the Lists:
LIST I
(Chemical process)
LIST II
(Reaction)
A.
Electrolysis of water
1.
Double displacement
reactionB.
Burning of coal
2.
Combination reaction
C.
Iron nail immersed in copper sulphate solution
3.
Decomposition reaction
D.
Addition of barium chloride solution to aluminium sulphate solution
4.
Displacement reaction
Consider the following reaction:
Fe2O3(s) + 2Al(s) → 2Fe(s) + Al2O3(s)
Which of the following statements about the given reaction is NOT correct?
