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प्रश्न
In the extraction of aluminium: Why is it necessary to replace anodes time to time?
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उत्तर
The anode is replaced from time to time because it gets oxidised by oxygen which evolves at it.
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संबंधित प्रश्न
Define the Ore.
Name one metal which is extracted by:
Electrolytic reduction.
Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.
Define the term gangue.
Name the metal which is extracted from haematite ore.
Which metal is extracted from bauxite ore?
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
The major ore of aluminium is known as ______.
Which of the following is an ore of mercury metal?
Give the principles of electromagnetic separation.
Aluminum is used in thermite welding:
write reaction for process?
Name the ore of mercury. With the help of balanced chemical equations, explain the process of extraction of mercury from its ore.
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
State the property of the metal being utilized in the following :
| Use of metal | Property |
| Zinc in Galvanization | |
| Aluminium in Thermite welding |
Froth floatation process is generally used to concentrate ______ ores.
What is the difference between calcination and roasting?
Write the name.
The process of extraction of aluminium from alumina-
In the electrolytic method, a layer of highly active metal is applied to a less active metal.
Bauxite reacts with sodium hydroxide in the Bayer’s 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 the reason why the above reaction is known as a thermite reaction.
