Answers

2015-09-21T22:06:35+05:30
Hydrogen gas makes a pop sound when exposed to a matchstick.
0
hope my answer helped u
plzz mark me the best.
2015-09-21T22:09:21+05:30
Hydrogen(H₂) gas makes a 'pop' sound exposed to lighted matchstick. 
2 2 2
When a burning splinter is introduced to a cylinder/beaker containing Hydrogen(h2) it gets extinguished with a pop sound,