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प्रश्न
Define the term : Flux
उत्तर
Flux: The substance added to get rid of gangue in the extraction of metal is called flux.
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संबंधित प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
Give the principles of the hydrolytic method.
Give reasons, why aluminum is used in:
making alloys
Define the following term.
Mineral
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
What is passive iron?
Extraction of moderately reactive elements is done by _______ and _______ method.
Sulphide ores : Roasting : : Carbonate ores : _______
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
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.
