Question

The principal ore of aluminium is

• A. Bauxite
• B. Haematite
• C. Galena
• D. Magnetite

Hint:

Remember that bauxite is the key ore for extracting aluminium, while other minerals like haematite are used for iron extraction.

Answer 1

The Correct Option is A

Step 1: What is an ore.
An ore is a mineral from which a metal can be taken out in a cheap and easy way. We must find the main ore of aluminium.
Step 2: Name the aluminium ore.
The chief ore of aluminium is bauxite. Bauxite is a hydrated oxide of aluminium, written about as $\text{Al}_2\text{O}_3 \cdot x\text{H}_2\text{O}$.
Step 3: Check haematite.
Haematite is $\text{Fe}_2\text{O}_3$. It is an ore of iron, not aluminium.
Step 4: Check galena.
Galena is $\text{PbS}$. It is an ore of lead, not aluminium.
Step 5: Check magnetite.
Magnetite is $\text{Fe}_3\text{O}_4$. It is again an ore of iron, not aluminium.
Step 6: Final choice.
Only bauxite is an ore of aluminium, so it is the principal ore.\[ \boxed{\text{Bauxite}} \]