What is pig iron?

In the extraction of iron from haematite,the impurity $(x)$ of the ore is removed in the form of '$y$'. What are $x$ and $y$ respectively?

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

The main reactions occurring in a blast furnace during the extraction of iron from haematite are $....$.
$(i)$ $Fe_2O_3 + 3CO \to 2Fe + 3CO_2$
$(ii)$ $FeO + SiO_2 \to FeSiO_3$
$(iii)$ $Fe_2O_3 + 3C \to 2Fe + 3CO$
$(iv)$ $CaO + SiO_2 \to CaSiO_3$

During the extraction of silver,which of the following is formed?

Assertion : Copper obtained after $Bessemerization$ is known as blister copper.
Reason : Blisters are produced on the surface of the metal due to escaping of dissolved $SO_2$.