Advertisements
Advertisements
Question
What is the role of cryolite in the metallurgy of aluminium?
Solution 1
Cryolite (Na3AlF6) has two roles in the metallurgy of aluminium:
1. To decrease the melting point of the mixture from 2323 K to 1140 K.
2. To increase the electrical conductivity of Al2O3.
Solution 2
It lowers the fusion (melting) point of the bath from 2323 K to about 1140 K. ,
It makes alumina a good conductor of electricity.
APPEARS IN
RELATED QUESTIONS
Explain refining of nickel by Mond process.
Write the reactions involved in extraction of silver from its ore by leaching process.
Copper can be extracted by hydrometallurgy but not zinc. Explain.
What is the role of graphite rod in the electrometallurgy of aluminium?
Mention the names of various steps involved in the extraction of pure metals from their ores.
What should be the considerations during the extraction of metals by electrochemical method?
In Hall's process, the main reagent is mixed with ______.
Give reasons for the following statement:
Copper does not displace hydrogen from acids.
Al2O3 was leached with alkali to get X. The solution of X on passing of gas Y forms Z. X, Y and Z respectively are:
Match List-I with List-II:
| List-I | List-II |
| Industrial process | Application |
| (a) Haber's process | (i) HNO3 synthesis |
| (b) Ostwald's process | (ii) Aluminium extraction |
| (c) Contact process | (iii) NH3 synthesis |
| (d) Hall-Heroult process | (iv) H2SO4 synthesis |
Choose the correct answer from the options given below:
Which of the following chemical reactions represents Hall- Heroult Process?
The purest form of commercial iron is ______.
