Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture

⇦

⇨

Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture of

Options

(a) Al₂O₃ + HF + NaAlF₄
(b) Al₂O₃ + CaF₂ + NaAlF₄
(c) Al₂O₃ + Na₃AlF₆ + CaF₂
(d) Al₂O₃ + KF + Na₃AlF₆

Correct Answer:

Al₂O₃ + Na₃AlF₆ + CaF₂

Explanation:

Electrolytic mixture contains alumina (Al₂O₃), cryolite (Na₃AlF₆) and fluorspar(CaF₂) in the ratio of 20 : 40 : 20. Due to presence of these conductivity of alumina increases and fusion temperature decreases from 2000⁰C to 900⁰C.

Related Questions:

1. Equal masses of H₂, O₂ and methane have been taken in a container of volume
2. If the equilibrium constant for reaction is K, the equilibrium constant for
3. If 0.2g of an organic compound containing carbon, hydrogen, and oxygen on combustion
4. Action of water or dilute mineral acids on metals can give
5. Treatment of a mixture of CH₃Cl and C₂H₅Cl with sodium in dry ether can generat

Topics: Surface Chemistry and Isolation of Elements (88)
Subject: Chemistry (2512)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends