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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
Name the following:
Main ore of aluminium.
A zinc ore gave CO2 on treatment with a dilute acid. Identify the ore and write its chemical formula.
How is manganese extracted from manganese dioxide, MnO2? Explain with the help of an equation.
Define the term ore.
Explain giving equation, what happens when:
A mixture of Cu2O and Cu2S is heated.
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
An ore of manganese metal is ______.
Which of the following metals can be obtained from haematite ore?
The metal which can be extracted simply by heating the cinnabar ore in air is ______.
Which metal can be extracted from the following ore?
Calamine
Define the following term.
Gangue
Name the following:
Two metals which are found in the free or native state.
Write equations for each of the above metal which reacts with water.
Name the methods by which concentrated ore is converted to metallic oxide.
Define calcination.
Find the odd one out and give its explanation.
Write the molecular formulae of the following compound.
Fluorspar
Explain the concept of Calcination.
Which of the following metals exist in their native state in nature?
(i) Cu
(ii) Au
(iii) Zn
(iv) Ag
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?
