In the Goldschmidt reaction,certain metallic oxides are reduced to the metallic state by heating with:

In the extraction process of copper,the product obtained after carrying out the reactions
$(i) 2 Cu_2S + 3 O_2 \rightarrow 2 Cu_2O + 2 SO_2$
$(ii) 2 Cu_2O + Cu_2S \rightarrow 6 Cu + SO_2$ is called

Which of the following has maximum iron content?

During the electrolytic reduction of alumina,the reaction at the cathode is:

In the extraction of copper from its sulphide ore,the metal is formed by the reduction of $Cu_2O$ with:

In the manufacture of steel,the Bessemer converter contains a lining of: