Question

How would you show that hydrogen :

(a) is a non-supporter of combustion ?

(b) is lighter than air ?

Answer 1

(a) Hold a hydrogen gas lled jar with its mouth downwards.
Place a lighted candle inside the jar. The candle gets extinguished but the gas bums with a pop sound.
This shows that hydrogen is non-supporter of combustion.
(b) Take a delivery tube and place one of its ends in a soap solution kept in a trough and the other one in a at bottom jar as shown in the gure. The soap bubbles containing hydrogen rise upward the air. The rising soap bubbles prove that hydrogen is lighter than air.