why does a matchstick burn on rubbing it on the side of the Matchbox
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When the matchstick is rubbedagainst the side of the match box, some of the red phosphorus is converted into white phosphorus; this immediately reacts with potassium chlorate in the matchstick head to produce enough heat to ignite antimony trisulphide and starts the combustion of matchstick.
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because of rough surface due to friction heat is produced and matchstik lights up
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