The smelting of iron in the blast furnace involves all the following processes except:

What is the percentage of carbon in steel?

Which of the following species is (are) desirable substance$(s)$ in the extraction of copper but not in the extraction of iron?

Given below are two statements related to Ellingham diagram:
Statement-$I$ : Ellingham diagrams can be constructed for formation of oxides,sulfides and halides of metals.
Statement-$II$ : It consists of plots of $\Delta_f H^0$ vs $T$ for formation of oxides of elements.
In the light of the above statements,choose the most appropriate answer from the options given below:

Select the correct matching:

Railway wagon axles are made by heating rods of iron embedded in charcoal powder. The process is known as