"Hydro metallurgy" method is used for the extraction of the following metals-

$\left(\mathrm{Ag}+\mathrm{Pb}\right) \mathrm{alloy}\stackrel{\mathrm{Melt} \mathrm{and} \mathrm{add} \mathrm{zinc}}{\to }\left(\mathrm{Ag}+\mathrm{Pb}+\mathrm{Zn}\right) \mathrm{melt}\stackrel{\mathrm{Cool}}{\to }\boxed{\frac{\mathrm{Layer} \mathrm{X}}{\mathrm{Layer} \mathrm{Y}}}$

Select correct statement based on above scheme:

Bessemerisation is carried out for

(i) $\mathrm{Fe}$

(ii) $\mathrm{Cu}$

(iii) $\mathrm{Al}$

(iv) silver

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: