Electrolytic reduction of alumina to aluminium by Hall−Heroult process is carried out:
Correct answer: C. In the presence of cryolite which forms a melt with lower melting temperature.
- A. In the presence of NaCl.
- B. In the presence of fluorite.
- C. In the presence of cryolite which forms a melt with lower melting temperature.
- D. In the presence of cryolite which forms a melt with higher melting temperature.
Explanation
Option C is correct. The electrolytic reduction of alumina to aluminum by the Hall-Heroult process is indeed carried out in the presence of cryolite. Cryolite lowers the melting temperature of the mixture, enabling the process to be conducted at a lower temperature and thus more energy-efficient. Options A, B, and D are incorrect as they mention NaCl, fluorite, and a higher melting temperature of the melt, respectively, which do not align with the actual process.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
Practise s-Block and p-Block Elements
1,359 free s-Block and p-Block Elements MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More s-Block and p-Block Elements questions
Major ore of lead is:
In the Hoope's process for refining of aluminium, the fused materials form three different layers and they remain separated during electrolysis also. This is because:
A mineral is called ore if:
Tetraethyl lead is a:
Among the following separation processes, concentration technique is used in the-----
Which property of aluminium is used for extraction of metals from their ores?