Calcination is used in metallurgy for the removal of

$A$ sulphide ore is first converted into its oxide before reduction. This is done because

The process that involves the removal of sulphur from the ores is

In calcination,the ore is heated in $......$.

Which one of the following statements is false?

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: