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प्रश्न
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
उत्तर
Oxygen gas is liberated at anode as :
\[\ce{O2- - 2e- -> [O] }\]
\[\ce{[O] + [O] -> O2}\]
The oxygen formed at anode oxidizes the carbon of the anode to carbon dioxide.
\[\ce{C + O2 -> CO2}\]
As a result the anode gets oxidized and it has to be replaced periodically.
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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.
Name the most abundant metal in the earth's crust.
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
Give reasons, why aluminum is used in:
painting electric and telegraphic poles
Define roasting.
Name the following :
The Process of heating an ore to a high temperature in the presence of air.
Write the molecular formulae of the following compound.
Sodium aluminate
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
Which of the following metals exist in their native state in nature?
- Cu
- Au
- Zn
- Ag
