Question

11. How to show that when we heat high quality coal, a gas evolve
y coal, a gas evolves which can be burnt​

Answer 1

Ummm (⊙_⊙;) the gas evolved is CO2 which does not support combustion

But it might as well be Hydrogen a highly flammable gas that is asked here

It burns with a pop sound

So ermm...

¯\_(ツ)_/¯

do mark as bRaInliEsT if the answer was satisfactory