Question

Assertion :Metals at the top of reactivity series are not formed in nature as free element.

Reason :- The sulphide ores are converted into oxides by heating in the absence of air in the process​

Answer 1

Answer:

Metals such as iron, zinc, lead, copper, etc., are in the middle of the reactivity series. These are moderately reactive metals and are usually present as sulphides or carbonates. A metal is obtained from its ore by the processes of reduction or by electrolysis. In the reduction process, it is the oxide ore that is reduced.

It is easier to reduce an oxide ore as compared to its sulphides and carbonates. If the ore is not an oxide ore, it is first converted to the oxide by the process of calcination or by roasting.