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प्रश्न
Explain the concept of Roasting.
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उत्तर
In roasting process, the sulphide ores are strongly heated in air to transform them into oxides. In this process, sulphide ores are oxidized to form metal oxides and sulphur dioxide gas.
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संबंधित प्रश्न
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
A zinc ore on heating in air forms sulphur dioxide. Describe briefly any two stages involved in the conversion of this concentrated ore into zinc metal.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Calamine ore can be used to extract one of the following metals. This metal is:
Define the term:
Slag
Complete the incomplete statement with missing word:
Metals are malleable while non-metals are ______.
How many valence electrons are present in non- metals?
Answer the following question :
What is the difference between calcination and roasting.
Name the methods by which concentrated ore is converted to metallic oxide.
How is the method of extraction of metals high up in the reactivity series different from that for metals in the middle? Why can the same process not be applied for them? Name the process used for the extraction of these metals.
Iron is _______.
Aluminium oxide is _______ oxide.
Zinc sulphide : Roasting : : zinc carbonate : _______
Write the name.
Metals which are amphoteric in nature.
Explain concept with example/explain with the help of a balanced equation.
Ionic bond and ionic compounds
Explain concept with example/explain with the help of a balanced equation.
Calcination
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
In extraction of copper, the flux used is ____________.
Electrical wires have a coating of an insulting material. The material, generally used is
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.
