Why do we get a popping sound when we bring a burning stick near the mouth of test tube containing acids and metals?

Asked by Topperlearning User | 22nd Dec, 2014, 11:05: AM

Expert Answer:

When a metal reacts with acid then hydrogen gas is evolved. Therefore, the test tube containing metal and acid contains evolving hydrogen gas. When a burning stick is brought near the mouth of the test tube then the evolving hydrogen gas is burnt with a pop sound.

Answered by  | 22nd Dec, 2014, 01:05: PM