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प्रश्न
Name the following:
Main ore of aluminium.
Name the ore for aluminium.
Give one word for the following:
An ore of aluminium.
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उत्तर
Bauxite (Al2O3.nH2O) is the main ore of aluminium.
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संबंधित प्रश्न
Define the Ore.
Give a reason for the following:
Carbonate and sulphide ores are usually converted into oxides during the process of extraction of metals.
Name the most abundant metal in the earth's crust.
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Name one metal which is extracted by electrolytic reduction.
Name one metal which is extracted by reduction with heat alone.
Fill in the following blank with suitable word:
Bronze is an alloy of copper and .........
Define the term ore.
Which metal is extracted from bauxite ore?
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
An ore of manganese metal is:
(a) bauxite
(b) haematite
(c) cuprite
(d) pyrolusite
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
The metal which can be extracted from the bauxite ore is:
(a) Na
(b) Mn
(c) Al
(d) Hg
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
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
The metal which can be extracted simply by heating the cinnabar ore in air is:
(a) Zn
(b) Cu
(c) Al
(d) Hg
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium
(b) tin
(c) zinc
(d) copper
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
(a) Name the metal and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why?
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.
Aluminum is used in thermite welding:
what is thermit?
Name the following:
The substance added to get rid of gangue in the extraction of metal.
Name the following:
The process in which an ore is heated in air so that oxygen gets added to it to form the oxides.
Compare the process of calcination and roasting.
Name:
The allotrope of the non-metal carbon which conducts electricity.
Name the following:
A steel grey coloured solid non-metal.
Name the methods by which concentrated ore is converted to metallic oxide.
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.
Iron is _______.
Write the name.
Metals which are amphoteric in nature.
Write the molecular formulae of the following compound.
Sodium aluminate
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Explain in brief types of extraction of highly reactive metals according to their reactivity.
Explain in brief types of extraction of moderately reactive metals according to their reactivity.
Explain Bayer’s process of concentration of bauxite with a chemical equation.
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
In extraction of copper, the flux used is ____________.
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Identify the substance oxidised and reduced in the above reaction.
