Advertisements
Advertisements
प्रश्न
Fused alumina is reduced to aluminium by electrolytic reduction, since ______.
विकल्प
Alumina is highly stable
Alumina is least stable
Alumina is not reduced by drying agents.
Alumina is not reduced by reducing agents.
उत्तर
Fused alumina is reduced to aluminium by electrolytic reduction, since Alumina is highly stable.
APPEARS IN
संबंधित प्रश्न
Give the chemical names and formulae of the main ores of zinc.
Aluminium is a more active metal than iron, but suffers less corrosion. Why?
Name three alloys of steel. Give their compositions and uses.
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?
For the substance listed below, explain its role in the extraction of aluminium: Cryolite
Answer the following question :
Name a metal which is found abundantly in earth's crust.
Describe the role played in the extraction of aluminum:
Sodium hydroxide
Name the alloy used for the following purpose.
Making medals
In Hall and Heroult's process, products liberated at anode and cathode are ______
The compound that is not an ore of aluminum is ______.