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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 extraction of aluminium: Name the process of concentration of bauxite.
Name one metal which is extracted by electrolytic reduction.
How are the less reactive metals (which are quite low in the reactivity series) extracted? Explain with the help of an example.
Name one ore of copper (other than cuprite). Which compound of copper is present in this ore? Also, write its chemical formula.
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
Name two metals which are found in nature mainly in the free state (as metallic elements).
Which metal is extracted from bauxite ore?
Name one ore of mercury. Which mercury compound is present in this ore? Write its chemical formula.
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
What is meant by refining of metals? Name the three common methods used for refining.
Write equations for each of the above metal which reacts with water.
Define roasting.
Aluminium oxide is _______ oxide.
Gold and silver are active metals.
Explain the following reaction with the balanced equation.
Chlorine dissolved in water
Explain in brief types of extraction of highly reactive metals according to their reactivity.
Explain Bayer’s process of concentration of bauxite with a chemical equation.
The highly reactive metals like Sodium, Potassium, Magnesium, etc. are extracted by the ____________.
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?
Give the reaction involved during extraction of zinc from its ore by
- roasting of zinc ore
- calcination of zinc ore
