Advertisements
Advertisements
प्रश्न
Name the following:
The materials used as electrodes in the electrolytic extraction of aluminium.
उत्तर
Cathode: inner lining of gas-carbon of the electrolytic cell.
Anode: Thick carbon rods dipping into the fused electrolytes.
APPEARS IN
संबंधित प्रश्न
Explain with reason:
Carbon can reduce lead oxide but not aluminium oxide.
In order to obtain 1 tonne of aluminium, the following inputs are required: 4 tonnes 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 (III) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
- Name the process used for the purification of bauxite.
- Write the equation for the action of heat on aluminium hydroxide.
In order to obtain 1 tonne of aluminium, the following inputs are required: 4 tonnes 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 (III) oxide. Aluminium is obtained by the electrolysis of aluminium oxide dissolved in cryolite.
- Write the formula of cryolite.
- Write down the word which correctly completes the following sentence.
By dissolving aluminium oxide in cryolite, a ______ (conducting/non-conducting) solution is produced. - Why is so much graphite required for the electrolytic process?
- Write the equation for the reaction which takes place at the cathode.
- What is cathode made up of?
Why is food containing iron salts should not be cooked in aluminium utensils?
Write balanced equation for the following reaction:
Aluminium powder is warmed with hot and concentrated caustic soda solution.
The following question relate to the extraction of aluminium by electrolysis.
Explain why is it necessary to renew the anode periodically.
Write the equation for the reaction where the aluminium oxide for the electrolytic extraction of aluminium is obtained by heating aluminium hydroxide.
In Hoope's process, pure aluminium is collected at the ______ of the electrolytic cell.
State the relevant reason for the following:
Graphite anodes are continuously replaced during the electrolysis of alumina.
Write the balanced chemical equation to show the concentration of ore in Baeyer’s process.
Aluminium hydroxide to alumina
