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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
Silver metal does not combine easily with oxygen but silver jewellery tarnishes after some time. How?
Which one of the methods given in column I is applied for the extraction of each of the metals given in column II:
| Column I | Column II |
| Electrolytic reduction | Aluminium |
| Reduction with Carbon | Zinc |
| Reduction with Aluminium | Sodium |
| Iron | |
| Manganese | |
| Tin |
Give the name and chemical formula of one ore of copper.
An ore of manganese metal is ______.
The major ore of aluminium is known as ______.
Rock salt is an ore of one of the following metals. This metal is:
A sulphide ore is converted into metal oxide by the process of ______.
State three objectives achieved during the roasting of ores.
Give the principles of electromagnetic separation.
Some metallic oxides can be reduced by hydrogen, carbon and carbon monoxide and some cannot. Explain.
Name the following:
Name two metals always find in combined state.
The following question relate to the extraction of aluminium by electrolysis.
Give the equation for the reaction which takes place at the cathode.
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Name the methods by which concentrated ore is converted to metallic oxide.
Froth floatation process is generally used to concentrate ______ ores.
Atomic number of aluminium is _______ and its electronic configuration is _______.
Explain the following reaction with the balanced equation.
Zinc sulphide is heated strongly in excess of air
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Explain Bayer’s process of concentration of bauxite with a chemical equation.
Which of the following ore is concentrated by the Froth floatation process?
