Question

name the colourless gas that evolves when potassium reacts with water how will you test this gas​

Answer 1

hydrogen

can be tested by pop sound of matchstick when brought to the mouth of test tube

Answer 2

heyyy.......

hydrogen gas is evolved when potassium is added to water

TEST -  we can test it by bringing a burning candle near the mouth of the test tube.

hope it helps....