Question

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iron does not burn on heating but iron filings burn vigorously when sprinkled in the flame of the burner give the reason

Answer 1

The mass of a small particle is such that the entire particle can be heated to ignition temperature. An iron rod will not burn as it has relatively very less surface area per unit mass but iron filings with more surface area per unit mass can burn in air and get converted to iron oxide.

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Answer 2

hey!
Burning" is a reaction between a combustible substance and oxygen. Contrary to common belief, many metals including iron) are combustible, meaning that they will react with oxygen and release heat. The reason an iron bar won't generally burn is because the oxygen can't get inside.
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