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

Aluminium Is Extracted From Alumina Alo By Electrolysis Of A Chemistry Question

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. The most easily hydrolysed molecule under SN1 conditions is
  2. Malachite is an ore of
  3. IUPAC name of CH₃CH₂CH₂CH(CH₃)COCH₃ is
  4. A certain mass of gas occupies a volume of 300 c.c. at 27⁰C and 620 mm pressure
  5. Which of the following does not contain aluminium

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.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*