The correct statements from the below 1.Charcoal can be obtained on heating wood in absence of air. 2.Charcoal is impure form of graphite. 3.Diamond is thermodynamically the most stable allotrope of carbon. 4.Coke is used as an oxidising agent during the extraction of iron from its ores.

Step-by-step solution

Statements I and II are correct, whereas statements III and IV are incorrect. Charcoal is a lightweight black carbon residue produced by strongly heating wood in minimum amount of oxygen. It is impure form of graphite. Graphite is thermodynamically the most stable allotrope of carbon not diamond. Coke is used as reducing agent during extraction of iron from its ore.