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प्रश्न
Explain the concept of Calcination.
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.
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संबंधित प्रश्न
Define the Ore.
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
Explain why, carbon cannot reduce oxides of sodium or magnesium.
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
How is aluminium metal extracted? Explain with the help of an equation.
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
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?
Haematite
Aluminum is used in thermite welding:
write reaction for process?
Name the following:
The substance added to get rid of gangue in the extraction of metal.
Define the term : Gangue
Name : The metal which is liquid at room temperature.
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
Name the following:
The process of heating an ore to a high temperature in the presence of air.
Mercury, silver, gold are highly reactive metals.
Explain the following reaction with the balanced equation.
Sodium aluminate reacts with water
Explain in brief types of extraction of less reactive metals according to their reactivity.
Electrical wires have a coating of an insulting material. The material, generally used is
Assertion (A): The extraction of metals from their sulphide ores cannot take place without roasting the ore.
Reason (R): Roasting converts sulphide ores directly into metals.
