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प्रश्न
Extraction of moderately reactive elements is done by _______ and _______ method.
पर्याय
roasting and calcination
roasting and reduction
separation and calcination
none of these
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उत्तर
Extraction of moderately reactive elements is done by roasting and calcination method.
संबंधित प्रश्न
In the electrolytic refining of a metal M, what would you take as the anode, the cathode and the electrolyte?
The process by which sulphide ore is concentrated.
Define the term ore.
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
Name the gas evolved when cinnabar ore is roasted.
What iron compound is present in haematite ore? Also write its chemical formula.
Name one ore of sodium. Name the sodium compound present in this ore and write its chemical formula.
Which metal is extracted from calamine ore?
Calamine ore can be used to extract one of the following metals. This metal is:
(a) copper
(b) mercury
(c) aluminium
(d) zinc
Which of the following metals can be obtained from haematite ore?
(a) copper
(b) sodium
(c) zinc
(d) iron
During galvanisation, iron metal is given a thin coating of one of the following metals. This metal is:
(a) chromium
(b) tin
(c) zinc
(d) copper
Calamine ore can be converted into zinc oxide by the process of:
(a) dehydration
(b) roasting
(c) calcination
(d) sulphonation
Give the principles of the froth floatation process.
Aluminum is used in thermite welding:
what is ignition mixture?
To protect iron from rusting, it is coated with a thin layer of zinc. Name the process.
Which one of the following is not true of metal :
Metals are malleable and ductile
Draw a well-labelled diagram of extraction of Aluminium. Write the anode reaction in electrolytic reduction of Alumina.
Write the name.
The process of strong heating of carbonate ores in insufficient air–
In the electrolytic reduction of alumina, the lining of graphite acts as an anode.
The given reaction shows one of the processes to extract the metals like Iron and Manganese.
\[\ce{MnO2(s) + Al(s) -> Mn(l) + Al2O3(s) + Heat}\]
Identify the substance oxidised and reduced in the above reaction.
