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प्रश्न
Identify who I am!
Ore of Aluminum- ______
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उत्तर
Ore of Aluminum- Bauxite
APPEARS IN
संबंधित प्रश्न
Define the Ore.
Give one word or a phrase:
The process by which sulphide ore is concentrated.
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
Why does a new aluminium vessel lose shine so soon after use?
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
Which metal is extracted from bauxite ore?
The metal which can be extracted simply by heating the cinnabar ore in air is ______.
A black metal oxide XO2 is used as a catalyst in the preparation of oxygen gas from potassium chlorate. The oxide XO2 is also used in ordinary dry cells. The metal oxide XO2 cannot be reduced satisfactorily with carbon to form metal X.
- Name the metal X.
- Name the metal oxide XO2.
- Which reducing agent can be used to reduce XO2 to obtain metal X?
- Name another metal which can also be extracted by the reduction of its oxide with the above reducing agent.
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
What is meant by refining of metals?
Write equations for each of the above metal which reacts with water.
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Name the following:
A steel grey coloured solid non-metal.
Name the process used for the enrichment of sulphide ore.
In electrolytic reduction of alumina _______ is used as a cathode.
Explain concept with example/explain with the help of a balanced equation.
Calcination
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
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.
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Give a reason why Aluminium is preferably used in thermite reactions.
