During which of the following processes is an ore converted into its oxide?

The process of roasting of an ore is carried out in the

In metallurgy,select the correct option using $T$ (True) or $F$ (False) for the statements given regarding calcination:
$(1)$ It is used to remove moisture.
$(2)$ It is used to decompose carbonates.
$(3)$ It is used to remove volatile impurities.

Consider the following statements:
Roasting is carried out to:
$(i)$ convert sulphide to oxide and sulphate
$(ii)$ remove water of hydration
$(iii)$ melt the ore
$(iv)$ remove arsenic and sulphur impurities
Of these statements:

Match the following:

List-$I$	List-$II$
$(I)$ Calcination	$a. Fe_2O_3 \cdot nH_2O \rightarrow Fe_2O_3 + nH_2O$
$(II)$ Roasting	$b. 2Cu_2S + 3O_2 \rightarrow 2Cu_2O + 2SO_2$
$(III)$ Flux	$c. SiO_2 + FeO \rightarrow FeSiO_3$
$(IV)$ Thermite	$d. Cr_2O_3 + 2Al \rightarrow Al_2O_3 + 2Cr$

In what form should the concentrated ore be converted? Why?