Question

Extraction of which one of the following metals involves concentration of the ore by leaching?

• A. Copper
• B. Magnesium
• C. Aluminum
• D. Potassium

Answer 1

Answer: (C)

Aluminum

Answer 2

The correct option is (C): Aluminum
By using aq. NaOH solution at high temperature and high pressure, bauxite, ($Al_2O_3.2H_2O$), the ore of aluminum is concentrated by leaching.