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Which of the following is an example of roasting?

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Important Questions on Metallurgy

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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Silver is extracted from Ag2S by -
MEDIUM
Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Which of the reaction is suitable for concentrating ore by leaching process?
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
In Alumino-Thermite process aluminium is used as 
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Cinnabar is an ore of which of the following?
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Concentrated Cu2S is converted into oxide by roasting.
How impurities like sulphur and phosphorous are removed in this process? 
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Correct decreasing order of element oxygen, sulphur, aluminium and iron according to their abundance on earth crust is
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Which of the following metals can be extracted through alkali leaching technique?
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Calamine is the ore of metal:
HARD
Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Write two methods for obtaining a metal from its oxide ore.
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore

Give the appropriate term defined by the statement given below:

The process by which certain ores, specially carbonates, are converted to oxides in the absence of air.

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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore

During electrolytic production of aluminium, the carbon anodes are replaced from time to time because 

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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
MgCO3  →∆MgO+ CO2. Which reactiton is this?
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Which metallic mineral is famous in the Balghat district of Madhya Pradesh?
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Cinnabar is an ore of which metal?
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Which of the following is an oxide ore?
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Cinnabar is an ore of which metal:
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Which type of ores are concentrated by Froth flotation process?
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore

Give one phrase for the following statement:

The process by which sulphide ore is concentrated.

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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
What is the difference between roasting and calcination ? Write the chemical reaction that takes place during roasting and calcination of zinc ores.
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Science>Chemistry>Metallurgy>Chemical Processes of Concentrating the Ore
Among K, Mg, Au and Cu, the one which is extracted by heating its ore in air is