Advertisements
Advertisements
Question
Complete the following by selecting the correct option from the choices given :
The diavalent metal whose oxide is reduced to metal by electrolysis of its fused salt is ________
Options
Al
Na
Mg
K
Advertisements
Solution
The diavalent metal whose oxide is reduced to metal by electrolysis of its fused salt is Al.
APPEARS IN
RELATED QUESTIONS
Write a balanced chemical equation for each of the following reactions :
(i) Reduction of copper (II) oxide by hydrogen
Give equation for the following conversion: Aluminium to aluminium nitride.
Name oxide of one metal which is reduced by (give equation): Reduction with carbon
Name oxide of one metal which is reduced by (give equation): Reduction with heat alone
What is the type of bonding expected in a metallic chloride?
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.
(a) When bauxite is treated with sodium hydroxide solution, what happens to:
(i) the aluminium oxide?
(ii) The iron (III) oxide?
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.
Give the equations for the reduction of copper oxide.
Give the equations for the reduction of Lead (II) oxide.
The following sketch represents the electroplating of an Iron cup with Nickel metal.
Study the diagram and answer the following questions:

- During electroplating, the iron cup is placed at the cathode. Why?
- Name the ion that must be present in the electrolyte.
- State one condition that is necessary to ensure that the deposit is smooth, firm and even.
- Write the reaction taking place at the cathode.
- What change would you observe at the anode?
