Advertisements
Advertisements
प्रश्न
In the extraction of aluminium Write the cathode reaction in electrolytic reduction of alumina.
Advertisements
उत्तर
In the electrolytic reduction of alumina, the reaction at the cathode is as follows:
Al3+ + 3e- → Al
APPEARS IN
संबंधित प्रश्न
Give reasons.
Carbonate and sulphide ores are usually converted into oxides during the process of extraction.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Why does a new aluminium vessel lose shine so soon after use?
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Define the terms gangue.
Which metal is extracted from cinnabar ore?
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
(a) Name the metal and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why?
Which metal can be extracted from the following ore?
Calamine
Give the principles of electromagnetic separation.
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Name the following:
The mixture of materials fed into a furnace to extract a metal.
Which one of the following is not true of metal :
Metal will have 1 or 2 or 3 electrons in their valence shell.
Froth floatation process is generally used to concentrate ______ ores.
Write the name.
The process of strong heating of carbonate ores in insufficient air–
Explain concept with example/explain with the help of a balanced equation.
Roasting
Which of the following ore is concentrated by the Froth floatation process?
An alloy is
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
- Given below are the steps for extraction of copper from its ore. Write the reaction involved.
- Roasting of copper (I) sulphide
- Reduction of copper (I) oxide with copper (I) sulphide.
- Electrolytic refining
- Draw a neat and well labelled diagram for electrolytic refining of copper
