Question

write two chemical test for hydrogen and co2 gas

Answer 1

Carbon dioxide. A lighted wooden splint goes out in a test tube of carbon dioxidebut this happens with other gases, too. It is better to bubble the test gas through limewater - calcium hydroxide solution. Carbon dioxide turns limewater cloudy white.

Answer 2

Hydrogen gas also burns with a pop sound and CO2 gas turns lime water milky. ..