Question

A popping sound is produced when a burning candle is brought near the mouth of a test tube used in electrolysis of water

Answer 1

It is due to liberation of hydrogen gas.

Answer 2

Explanation:

HELLO DEAR,

During electrolysis of water , hydrogen gas and oxygen gas are realese due to passing of current in water.

And when a burning candle is brought near the test tube then fire is caught in the yest tube due to burning nature of hydrogen gas, thats why its produce popping sound.

I HOPE IT'S HELP YOU DEAR,

THANKS.