Question

explain why the pop sound was not produced in the other two test tubes?

Answer 1

Answer:

as hydrogen was not evolved the pop sound could not be produced

Answer 2

Answer:

A pop sound test is defined as the test that is used for testing of hydrogen gas. A pop sound is produced when the hydrogen gas reacts with oxygen. The hydrogen gas is collected in a test tube and a burning splint is held near the top of the test tube. A pop sound is produced when there is a reaction between hydrogen and oxygen.