Tests for gases

The idea

Hydrogen burns with a squeaky pop when a lighted splint is held at the mouth of the tube. Oxygen relights a glowing splint. Carbon dioxide turns limewater milky (cloudy). Chlorine bleaches damp litmus paper white.

1. Name the gas.
2. State the test.
3. State the positive result.

Watch out Oxygen relights a glowing splint; hydrogen gives a squeaky pop with a lighted splint.