Question

Iron doesn't burn but the iron fillings burn vigorously when sprinkle in the flame of the burner.Why ?
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Answer 1

Answer:

Iron has a strong molecular force of attraction. Hence when heated it doesn't reach to its ignition temperature and doesn't burn. But iron fillings when sprinkled in flames attain the ignition temperature ( as iron fillings are comparatively smaller particles) and gain larger surface area for the reaction.

Answer 2

Answer:

Because iron is having a greater surface area as compared to iron fillings.