The addition of silica during the extraction of copper from its sulphide ore:

What does the slag obtained during the extraction of iron primarily consist of?

Which of the following processes is associated with the smelting stage?

Which of the following statements is/are correct based on the provided Ellingham diagram?

The reactions which occur in a blast furnace at $500-800 \ K$ during the extraction of iron from haematite are:
$(i)$ $3 Fe_2O_3 + CO \rightarrow 2 Fe_3O_4 + CO_2$
$(ii)$ $Fe_2O_3 + 3 C \rightarrow 2 Fe + 3 CO$
$(iii)$ $Fe_3O_4 + 4 CO \rightarrow 3 Fe + 4 CO_2$
$(iv)$ $Fe_2O_3 + CO \rightarrow 2 FeO + CO_2$

In the extraction of copper,which reaction is responsible for the formation of metal during Bessemer conversion?