Chemistry
The following questions are asked with respect to the electrolytic process in the extraction of aluminium.
(a) Identify the components of the electrolyte other than pure alumina.
(b) Give the role played by these components.
Answer
(a) Cryolite and fluorspar are components of the electrolyte.
(b) Addition of cryolite lowers the fusion temperature from 2050°C to 950°C and enhances conductivity. Both cryolite & fluorspar act as a solvent for the electrolytic mixture and increase its conductivity since pure alumina is almost a non-conductor of electricity.
Related Questions
(a) For each of the substances given below, what is the role played in the preparation of NH3 (ammonia)
(a) CaO
(b) Mo
Calculate:
(a) The mass of 12.044 x 1023 oxygen atoms.
(b) What is the vapour density of ethylene?
Rajat mixed a white coloured compound A with water. The compound A reacted vigorously with water to produce a compound B and large amount of heat. He used the compound B to white wash the walls.
After 3 days of whitewash, the walls became shiny
(a) Name the compound A
(b) Why the walls appear shiny ? Write the reactions involved.
(c) State the type of reaction occurred here.
(a) Name the particles present in:
- Lead chloride
- Potassium nitrate
(b) Explain why powdered coke is sprinkled over the electrolytic mixture ?