Same chapter3 marksDifficulty: Medium
Name the process by which aluminium oxide is obtained pure from bauxite, and write the equations for the two main steps.
Metallurgy
3 marksDifficulty: Medium
Name the constituents and one use of brass, bronze and duralumin.
Original Khojo Papers practice question — not from a past board paper.
Answer
Brass is copper and zinc and is used for utensils and decorative articles. Bronze is copper and tin and is used for statues, medals and machine parts. Duralumin is aluminium with copper, magnesium and manganese and is used in aircraft parts because it is light and strong.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Alloying changes hardness, strength and resistance to corrosion.
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