Question

What happens when a burning matchstick is brought near the mouth of test tube in which a metal has reacted with sulphuric acid? why?

Answer 1

Answer:

When a matchstick is brought near the mouth of the test tube in which a metal has reacted with sulphuric acid, the matchstick produces a pop-sound nd stops burning. ... THE POP SOIND MADE IS DUE TO THE EVOLUTION OF HYDROGEN GAS, THEREBY, BURNING OUT THE FLAME.