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प्रश्न
Write the name.
The process of extraction of aluminium from alumina-
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उत्तर
The process of extraction of aluminium from alumina- Electrolytic reduction
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संबंधित प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
How many carats is pure gold? Why is pure gold not suitable for making ornaments?
Name two metals which are highly resistant to corrosion.
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
Which metal is extracted from calamine ore?
The two metals which are extracted by means of electrolytic reduction of their molten salts are:
(a) magnesium and manganese
(b) iron and aluminium
(c) zinc and magnesium
(d) magnesium and aluminium
A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising
When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity.
(a) What is metal A?
(b) What is metal C?
(c) Name the substance B.
(d) Name the substance D.
Name a non- metal that has a metallic luster and sublimes on heating.
Name the following:
The process of heating an ore to a high temperature in the presence of air.
Find the odd one out and give its explanation.
Write the name.
Metals which are amphoteric in nature.
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
In extraction of copper, the flux used is ____________.
Which of the following ore is concentrated by the Froth floatation process?
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
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.
Care must be taken while diluting concentrated nitric acid with water. Why?
