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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
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Give the name and chemical formula of one ore of copper.
Name the metal which is extracted from haematite ore.
Name the electrode at which aluminium metal is produced.
Which of the following is an iron ore?
(a) cinnabar
(b) calamine
(c) haematite
(d) rock salt
The metal which is always present in an amalgam is:
(a) iron
(b) aluminium
(c) mercury
(d) magnesium
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
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Answer the following questions based on the extraction of aluminium from alumina by Hall - Heroult’s Process :
What is the function of cryolite used along with alumina as the electrolyte?
Complete the incomplete statement with missing word:
Non-metals form acidic oxides while metals form ______.
Calcium, copper, lead, aluminium, zinc, chromium, magnesium, iron.
Choose the major metals from the list given above to make the following alloys:
(a) Stainless steel
(b) brass
Define calcination.
In electrolytic reduction of alumina _______ is used as a cathode.
Extraction of moderately reactive elements is done by _______ and _______ method.
Write the name.
Metals which are amphoteric in nature.
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
Explain in brief electrolytic reduction of alumina with a neat labelled diagram.
Which of the following ore is concentrated by the Froth floatation process?
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.
