why gold is found in free state but iron is not?

Gold is the least reactive metal. It does not react with O, C ,CO3- etc. to form any compound and hence always found in free state.

Fe is a reactive metal . It react with the atmospheric oxygen to form oxide and thus it is mostly found in oxide form.

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least reactive metals r always found in free state like gold silver,platinum etc

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We all know that gold is placed in the bottom of the reactivity series, telling that gold is a noble metal. As it is less reactive, it is not found in compound. 

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