Gold is found in pure state in nature but not the iron because gold is un-reactive metal, so it does not react with other element in normal condition but iron is reactive metal so it reacts with atmospheric oxygen in presence of moist (water) to form oxide.
Explanation:
I hope it'll help you.
the combustion of fossil fuels and the smelting of sulphide ores and volcanic emissions.
That would be an endothermic reaction! :)
