Chemical Processes of Concentrating the Ore

Which of the following metals can be extracted through alkali leaching technique?

Which of the following is an example of roasting?

Leaching is used for the concentration of ores of

The process of leaching cannot be done for the extraction of

 In each of following questions, match the items of column 1 with those of column 2.

       Column 1                                                         Column 2

1.    Sulphides ores                                          1.   Electrolytic refining

2.    Carbonate ores                                         2.   Roasting

3.    Impure copper                                          3.   Reducing agent in thermite reaction

4.    Aluminium                                                 4.   Calcination       

Heating of concentrated carbonate ore in absence of air for its conversion into metal oxide ore is known as:

What process happens in leaching?

Leaching method is used to concentrate the ores of-

The process to heat the ore in the presence of excess supply of air below its melting point is called as _____ .

How can we convert ore into its oxide form? Explain with proper examples.

Which of the following method is used to convert ore into oxide?

Why do we convert ore into metal oxide?

Among $\mathrm{K}, \mathrm{Mg}, \mathrm{Au}$ and $\mathrm{Cu},$ the one which is extracted by heating its ore in air is
 

The process of heating some solid material or a substance in a controlled environment.and it is done to bring about some change in the substance physical or chemical constitution. These process is known as?  

The metal that is most prevalent in the earth's crust is ?

What is the name of the process of extraction of metals from their ores?

Which of the following is not an impurity generally present in crude metals?

Copper metal, from low grade copper ores, can be extracted using

In the roasting process, when sulphide ore is heated strongly in the presence of air, it is converted into metal oxide and releases the gas:

What is the difference between calcination and roasting?