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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
Give reasons.
Aluminium is a highly reactive metal, yet it is used to make utensils for cooking.
In the extraction of aluminium: Write the function and formula of cryolite in the extraction of aluminium.
Why does a new aluminium vessel lose shine so soon after use?
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 |
The two metals which can be extracted just by heating their sulphides in air are:
(a) sodium and copper
(b) copper and aluminium
(c) potassium and zinc
(d) mercury and copper
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
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.
Give reasons, why aluminum is used in:
In making ships
Define the following term.
Gangue
State one observation for each of the following :
Copper sulphate solution is electrolysed using copper electrodes.
Give the chemical formula of :
Bauxite
Name the following:
Name two metals always find in combined state.
Define the term:
Slag
Which method of refining is used to get 99.8% pure aluminium?
Answer the following question :
What is the difference between calcination and roasting.
Observe the given figure of reactivity series of metals and answer the following questions:
Reactivity series of metals
- Name two metals which react with water.
- Name two moderately reactive metals.
- Name the most highly reactive metal and the most less reactive metal.
Write the name.
Metals which are amphoteric in nature.
In extraction of copper, the flux used is ____________.
Which of the following ore is concentrated by the Froth floatation process?
- Given below are the steps for extraction of copper from its ore. Write the reaction involved.
- Roasting of copper (I) sulphide
- Reduction of copper (I) oxide with copper (I) sulphide.
- Electrolytic refining
- Draw a neat and well labelled diagram for electrolytic refining of copper
