Question

How can judge that any metal in the reactivity series can be reduce by heating alone or reducing with carbon.

Answer 1

Answer:

both is possible

Explanation:

The oxides of metals which are present at the bottom of reactivity series can be reduced tometals by action of heat alone e.g. mercury oxide can be reduced to mercury metal byheating it to a temperature of about 300°C. 

Carbon is used to reduce metals that are below carbon in reactivity series .Highly reactive metals cannot be reduced by carbon since carbon is less reactive than them.

Highly reactive metals can be reduced by introducing electricity