Question

If a flame test were performed on a test tube where oxygen gas was produced
Group of answer choices

bubbles would form

the gas would ignite (catch on fire)

a popping noise would occur

there is no positive flame test for oxygen gas

the flame would extinguish

Answer 1

Oxygen supports combustion, so a glowing splint placed into a test tube of O2 will relight (the flame is supported and burns more vigorously). Oxygen itself does not “catch on fire.”

Of the choices given, none state this exactly; the closest (though imperfect) match is "the gas would ignite (catch on fire)" — but better to say: a glowing splint will reignite.