Among the reactions $(a) – (d)$, the reaction(s) that does/do not occur in the blast furnace during the extraction of iron is/are

$(a)$ $\mathrm{CaO}+\mathrm{SiO}_{2} \rightarrow \mathrm{CaSiO}_{3}$

$(b) $ $3 \mathrm{Fe}_{2} \mathrm{O}_{3}+\mathrm{CO} \rightarrow 2 \mathrm{Fe}_{3} \mathrm{O}_{4}+\mathrm{CO}_{2}$

$(c)$ $\mathrm{FeO}+\mathrm{SiO}_{2} \rightarrow \mathrm{FeSiO}_{3}$

$(d)$ $\mathrm{FeO} \rightarrow \mathrm{Fe}+\frac{1}{2} \mathrm{O}_{2}$

An alloy which does not contain copper is

If the impurity in a metal has a greater affinity for oxygen and is more easily oxidised than the metal, then the purification of metal may be carried out by

Choose the correct code regarding Roasting process.

$(I)$ It is the process of heating ore in air to obtain the oxide

$(II)$ It is an exothermic process

$(III)$ It is used for hydrated oxide and oxysalt ore 

$(IV)$ It is used after the concentration of ore