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

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

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

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 :

Froth floatation process is used for concentration of

Give the correct order of initials $T$ or $F$ for following statements. Use $T$ if statement is true and $F$ if it is false.

$(i)$  In Gold schmidt thermite process aluminium acts as a reducing agent .

$(ii)$  $Mg$ is extracted by electrolysis of aq. solution of $MgCl_2$

$(iii)$  Extraction of $Pb$ is possible by carbon reduction method

$(iv)$  Red Bauxite is purified by Serpeck's process

Given below are two statements:

Statement $I:$ During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode.

Statement $II:$ During the Hall-Heroult electrolysis process, purified $Al _2 O _3$ is mixed with $Na _3 AlF _6$ to lower the melting point of the mixture.

In the light of the above statements, choose the most appropriate answer from the options given below: