Home/
Competitive Exams/
JEE Main & Advanced/
Chemistry/
Metallurgy and Qualitative Analysis/
Question 900008
JEE Chemistry · Hard

Metallurgy and Qualitative Analysis: Mixed MCQ

Solve this quality-checked JEE multiple-choice question, then review the correct answer and explanation.

Timer-based practiceDetailed answer reviewMobile-friendly flow
MixedHardQuestion 900008

Question

The Hall-Héroult process is used to extract:
  1. A
    Aluminium (electrolysis of molten Al₂O₃ dissolved in cryolite)
    Correct
  2. B
    Iron
  3. C
    Copper
  4. D
    Zinc

Correct answer

Aluminium (electrolysis of molten Al₂O₃ dissolved in cryolite)

Explanation

Hall-Héroult process: Al₂O₃ (alumina from bauxite by Bayer's process) is dissolved in molten cryolite (Na₃AlF₆) to lower the melting point. Electrolysis: cathode → Al³⁺ + 3e⁻ → Al (liquid). Anode → O²⁻ − 2e⁻ → O₂ (burns carbon anode). Cryolite lowers melting point from 2050°C to ~940°C.

Review Metallurgy and Qualitative Analysis notesStart timed chapter practice