Which of the following elements constitutes a major impurity in pig iron?

In the Ellingham diagram,the plot is drawn between:

Which of the following pairs is incorrectly matched?

Among the reactions $(a) - (d)$,the reaction$(s)$ that does/do not occur in the blast furnace during the extraction of iron is/are:
$(a)$ $CaO + SiO_2 \rightarrow CaSiO_3$
$(b)$ $3 Fe_2O_3 + CO \rightarrow 2 Fe_3O_4 + CO_2$
$(c)$ $FeO + SiO_2 \rightarrow FeSiO_3$
$(d)$ $FeO \rightarrow Fe + \frac{1}{2} O_2$

Which alloy contains $Cu$,$Sn$ and $Zn$?

Bronze is a mixture of . . . . . . metals.