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प्रश्न
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
उत्तर
An ore of copper, other than cuprite, is copper glance. Copper glance is a sulphide ore. The compound present in the ore is copper (I) sulphide. The chemical formula of the ore is Cu2S
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संबंधित प्रश्न
Name the following:
The property possessed by metals by which they can be beaten into sheets.
Name the metal which is extracted from the ore called 'rock salt'.
The two metals which can be extracted just by heating their sulphides in air are:
(a) sodium and copper
(b) copper and aluminium
(c) potassium and zinc
(d) mercury and copper
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
In an electrolytic tank, aluminium metal is being extracted by the electrolysis of molten aluminium oxide using carbon electrodes. It is observed that one of the carbon electrodes is gradually burnt away and has to be replaced.
(a) Which carbon electrode (cathode or anode) is burnt away?
(b) Why is this carbon electrode burnt away?
Name the following:
The substance added to get rid of gangue in the extraction of metal.
Name the following:
The process of heating an ore to a high temperature in the presence of air.
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
Explain Bayer’s process of concentration of bauxite with a chemical equation.
On the basis of reactivity metals are grouped into three categories:
- Metals of low reactivity
- Metals of medium reactivity
- Metals of high reactivity
Therefore metals are extracted in pure form from their ores on the basis of their chemical properties.
Metals of high reactivity are extracted from their ores by electrolysis of the molten ore.
Metals of low reactivity are extracted from their sulphide ores, which are converted into their oxides. The oxides of these metals are reduced to metals by simple heating.
(a) Name the process of reduction used for a metal that gives vigorous reaction with air and water both.
(b) Carbon cannot be used as a reducing agent to obtain aluminium from its oxide? Why?
(c) Describe briefly the method to obtain mercury from cinnabar. Write the chemical equation for the reactions involved in the process.
OR
(c) Differentiate between roasting and calcination giving chemical equation for each.
