Question

$WHAT \;DO\;YOU\;MEAN\;BY\;COMBUSTION$

Answer 1

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A chemical in which substance reacts with oxygen to giving hearts called combustion

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Answer 2

$\sf \pink{A  \: chemical \:  in  \: which  \: substance \:  reacts  \: with  \: oxygen \:  to \:  giving  \: hearts \:  called  \: combustion }$