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प्रश्न
In the extraction of aluminium: Name the process of concentration of bauxite.
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उत्तर
The process of concentration of bauxite is known as Bayer’s process.
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संबंधित प्रश्न
What chemical process is used for obtaining a metal from its oxide?
Write the steps involved in the extraction of pure metals in the middle of the activity series from their carbonate ores.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
The metal which can be extracted from pyrolusite ore is:
(a) mercury
(b) manganese
(c) aluminium
(d) magnesium
Which metal can be extracted from the following ore?
Calamine
State why aluminium is extracted from its oxide by electrolysis while copper, lead, iron by reducing agents and mercury and silver by thermal decomposition.
Explain the following:
Galvanization protects iron from rusting.
What is galvanized iron.
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
How many valence electrons are present in metals ?
Correct the following statement :
Copper reacts with nitric acid to produce nitrogen dioxide.
Name the following:
A steel grey coloured solid non-metal.
State three objectives achieved during the roasting of ores.
Atomic number of aluminium is _______ and its electronic configuration is _______.
Observe the following diagram and write answers.
- Name the method.
- Write anode reaction and cathode reaction.
- Why fluorspar and cryolite are added in the mixture?
Explain in brief types of extraction of less reactive metals according to their reactivity.
The process in which a carbonate ore is heated strongly in the absence of air to convert it into metal oxide is called ____________.
During extraction of metals, electolytic refining is used to obtain pure metals.
(a) Which material will be used as anode and cathode for refining of silver metal by this process?
(b) Suggest a suitable electrolyte also.
(c) In this electrolytic cell, where do we get pure silver after passing electric current?
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 a reason why Aluminium is preferably used in thermite reactions.
