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प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
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उत्तर
The process of concentration of bauxite is known as Bayer’s process.
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संबंधित प्रश्न
Name two metals which are highly resistant to corrosion.
Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
What is the difference between a mineral and an ore?
Name the electrode at which aluminium metal is produced.
Which metal is extracted from calamine ore?
An important ore of zinc metal is:
(a) calamine
(b) cuprite
(c) pyrolusite
(d) haematite
A sulphide ore is converted into metal oxide by the process of:
(a) carbonation
(b) roasting
(c) calcination
(d) anodising
Which metal can be extracted from the following ore?
bauxite
Distinguish between ‘roasting’ and ‘calcination’. Which of these two is used for sulphide ores and why?
Arrange the metals of copper, iron, magnesium, sodium and zinc in the decreasing order of reactivity.
Name the following:
A compound which is added to lower the fusion temperature of the electrolytic bath in the extraction of aluminium.
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 _________
Name the following:
A steel grey coloured solid non-metal.
In electrolytic reduction of alumina _______ is used as a cathode.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Explain the reactions of nonmetals with water with the help of examples.
Explain in brief types of extraction of less reactive metals according to their reactivity.
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
Explain the difference between Bayer’s process and Hall’s process by explaining the Bayer’s process.
