Advertisements
Advertisements
Question
Name the compound added to pure alumina to lower the fusion temperature during the electrolytic reduction of alumina.
Advertisements
Solution
Cryolite
APPEARS IN
RELATED QUESTIONS
Give equation for the following conversion: Aluminium hydroxide to aluminium oxide.
what is the function of cryolite in the extraction of aluminium, other than acting as a solvent for bauxite?
Name a non-metallic element which is a liquid at ordinary temperatures
In order to obtain one tone of aluminium, the following inputs are required:
4 tones of bauxite, 150 Kg of sodium hydroxide and 600 Kg of graphite.
The aluminium compound in bauxite is aluminium oxide and the main impurity is iron (II) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
(i) Write the formula of cryolite.
(ii) Write down the word which correctly completes the following sentence.
"By dissolving aluminium oxide in cryolite, a ______ (conducting / non- conducting) solution is produced.
(iii) Why so much graphite required for this electrolytic process.
(iv) Write the equation for the reaction which takes place at cathode.
Answer the following question :
Name the process used for the enrichment of sulphide ore.
Name the following :
A metal oxide that can be reduced by hydrogen
Answer the following question with respect by hydrogen :
Explain why powdered coke is sprinkled over than electrolytic mixture.
Write the observation for the following:
A paper dipped in potassium permanganate solution is put on the mouth of a test tube containing sulphur dioxide gas.
Write a balanced equation for the reduction of copper (ll) oxide by hydrogen.
Give the equation for the reduction of Zinc oxide.
