Advertisements
Advertisements
प्रश्न
Explain the concept of Calcination.
Advertisements
उत्तर
In the calcination process, carbonate ores are strongly heated in a limited supply of air to transform them into oxides. In this process, carbonate ores decompose to form a metal oxide and carbon dioxide gas.
APPEARS IN
संबंधित प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
In the electrolytic refining of a metal M, what would you take as anode, cathode and electrolyte?
Give a reasons for the following:
Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.
Name one metal which is extracted by:
Reduction with carbon.
The non-metal present in steel is ______.
The two metals which can be extracted just by heating their sulphides in air are ______.
The two metals which are extracted by means of electrolytic reduction of their molten salts are ______.
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.
- Which carbon electrode (cathode or anode) is burnt away?
- Why is this carbon electrode burnt away?
Which metal can be extracted from the following ore?
Haematite
Give the chemical formula of :
Sodium aluminate
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.
choose the most appropriate term to match the given description.
Heating of the ore in the absence of air to high temperature
Name the methods by which concentrated ore is converted to metallic oxide.
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
Gold and silver are active metals.
Explain in brief types of extraction of less reactive metals according to their reactivity.
The poorest conductor of heat among metals is ____________.
Electrical wires have a coating of an insulting material. The material, generally used is
