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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
Name the metal which is extracted from haematite ore.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Name two ores of zinc. Write the names of the chemical compounds present in them and give their chemical formulae.
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 from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
An element A which is a part of common salt and kept under kerosene reacts with another element B of atomic number 17 to give a product C. When an aqueous solution of product C is electrolysed then a compound D is formed and two gases are liberated.
(a) What are A and B?
(b) Identify C and D.
(c) What will be the action of C on litmus solution? Why?
(d) Write formula of the compound formed when element B reacts with an element E having atomic number 5.
Complete the incomplete statement with missing word:
Metals form positive ions while non- metals ______.
Define roasting.
Gold and silver are active metals.
Explain the concept of Calcination.
