| ⇦ | 
| ⇨ |
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: - Colloidal solution of gold is prepared by
- The compound which does not exist as hydrate form
- At equilibrium, the value of change in Gibb’s free energy (ΔG) is
- The number of unpaired electrons in 1s² 2s² 2p³ is
- Which of the following explains the sequence of filling the electrons
Topics: Surface Chemistry and Isolation of Elements
(88)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Colloidal solution of gold is prepared by
- The compound which does not exist as hydrate form
- At equilibrium, the value of change in Gibb’s free energy (ΔG) is
- The number of unpaired electrons in 1s² 2s² 2p³ is
- Which of the following explains the sequence of filling the electrons
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
Leave a Reply