Explain chemical properties of dihydrogen gas.

chemical properties of dihydrogen gas are:

Reaction with dioxygen gas:

When dihydrogen gas reacts with dioxygen gas, it forms water

2H₂ + O₂→ 2H₂O

i. Dihydrogen gas forms an explosive mixture with dioxygen gas.

ii. A large amount of heat is produced by this reaction.

Reaction with Metal oxide:

i. Dihydrogen gas is a good reducing agent.

ii. It reduces easily the metallic oxides.

For example: CuO + H₂→ Cu + H₂O

Reaction with active metals:

Dihydrogen gas combines with active metals like Na, K, Ca and forms the metallic hydride of that metal.

H₂ + 2Na → 2NaH

H₂ + 2K → 2KH

H₂ + Ca → CaH₂