Question

How will you know whether the combustion of any substance is complete or partial

Answer 1

if it is completely oxidised, it is a complete combustion, if not, partial

for eg;;

C + O2 == CO is partial

C + O2 == CO2 is complete

do you understand mate? if not tell me ok?

Answer 2

Answer:

if any substance undergoes complete combustion it gives clean flame ,if substance undergoes incomplete combustion it gives yellow flamr