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प्रश्न
What is meant by refining of metals? Name the three common methods used for refining.
उत्तर
Refining of metals: It is the further purification of metals obtained by reduction process to remove all the impurities.
Depending upon the nature of metal, nature of impurities and purpose for which metal is to be used.
The three methods used for refining are:
- Liquation.
- Distillation.
- Electrolytic refining.
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संबंधित प्रश्न
Name the method by which aluminium metal is extracted.
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
A metal which exists as a liquid at room temperature is obtained by heating its sulphide ore in the presence of air.
(a) Name the metal and write its chemical symbol.
(b) Write the name and formula of the sulphide ore.
(c) Give the equations of chemical reactions involved in the production of metal from its sulphide ore.
(d) Name a common device in which this metal is used.
(e) Can this metal displace copper from copper sulphate solution? Why?
Give reasons, why aluminum is used in:
In making ships
An element has its electron configuration as 2,8,8,2. Now answer the following questions.
a) What is the atomic number of this element?
b) What is the group of this element?
c) To which period does this element belong?
What is galvanized iron.
Name the following:
The process of heating an ore to a high temperature in the presence of air.
Write the name.
The molecular formula of main ore of aluminium –
Write the name.
Metals which are amphoteric in nature.
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.
