Chemicals cannot be further down into other chemicals using ordinary laboratory processes chemical 3 which is Iron. Thus option C is correct.
What is a laboratory?
The laboratory is refers place which is consists of scientific equipment to take place chemical reactions and make experiments to discover new substances.
Iron is a substance that cannot be further broken down into other chemicals using ordinary laboratory processes as it is an element, not compound and elements have specific properties so they can not be broken down like compounds.
Therefore, option C is appropriate.
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