| ⇦ | 
| ⇨ |
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: - The rate of reactions exhibiting negative activation energy
- If a neutral atoms is converted into a cation, then its
- If the hydrogen ion concentration of an acid decreases 10 times, its pH value
- In the reaction : 2P₂O₅ + 2HNO₃ → P₄O₁₀ + x, the term x is
- Which pair of atomic numbers represents s-block elements?
Topics: Surface Chemistry and Isolation of Elements
(88)
Subject: Chemistry
(2512)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The rate of reactions exhibiting negative activation energy
- If a neutral atoms is converted into a cation, then its
- If the hydrogen ion concentration of an acid decreases 10 times, its pH value
- In the reaction : 2P₂O₅ + 2HNO₃ → P₄O₁₀ + x, the term x is
- Which pair of atomic numbers represents s-block elements?
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