Question

Adding zinc to HCl produced hydrogen. A positive test for hydrogen gas would be

(Reaction D)

Group of answer choices

the formation of bubbles

a distinct color change in the solution

a flame test that makes a popping noise

the formation of a precipitate

a flame test that extinguishes the flame

Answer 1

A flame test that makes a popping noise.

Explanation: hydrogen gas is identified by the "squeaky pop" when a lit splint is brought near it. Bubbles only show a gas is produced, not that it's hydrogen.