i experts , in this question if we are reducing it in presence of "O2- oxygen" it means roasting is being done and if roasting is done that means it is a less reactive metal - and less reactive metals are at the bottom of reactivity series - so they are not in combined state ,,- but why here ans shows it is moderatly/medium reactive -- pls explain

Dear student,

Roasting is the process in which a sulfide ore is strongly heated in the presence of air to convert it into metal oxide. Metal such as iron, zinc, lead, copper, etc is in the middle of the reactivity series. These are moderately reactive metals and usually present as sulfide and carbonate ores.
The reaction goes in two-step indicates that the X is a moderately reactive metal. These sulphide ores are quite stable and it is first converted into the oxide. Then further reduction takes place.

Regards

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