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प्रश्न
In the extraction of aluminium: Draw the diagram for the extraction of aluminium.
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उत्तर
Extraction of aluminium:
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संबंधित प्रश्न
Name two metals which are found in nature in the free state.
How is copper extracted from its sulphide ore? Explain the various steps supported by chemical equations. Draw labelled diagram for the electrolytic refining of copper.
The process by which sulphide ore is concentrated.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Explain why, carbon cannot reduce oxides of sodium or magnesium.
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
Define the term mineral.
Name the metal which is extracted from haematite ore.
How is aluminium metal extracted? Explain with the help of an equation.
Manganese metal is extracted from manganese dioxide by a reduction process by making use of ______.
Metals X and Y can be recovered from the anode mud left behind after the electrolytic refining of copper metal. The coins made of metal X look new even after several years of use but the coins made of metal Y lose their shine gradually and get blackened soon. When metal X is alloyed with a small amount of metal Y, it becomes hard and hence suitable for making ornaments. What are metals X and Y? Also state the colour of metal X.
State three objectives achieved during the roasting of ores.
Give reasons, why aluminum is used in:
making alloys
How are metals refined by the electrolytic methods?
Complete the following by selecting the correct option from the choices given:
The metal which does not react with water or dilute H2SO4 but reacts with concentrated H2SO4 is _________
_______ is the least reactive metal.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Identify who I am!
Ore of Aluminum- ______
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 the reason why the above reaction is known as a thermite reaction.
