|
Answer» (a) Uses of oxygen are : - Spaceships: Liquid oxygen is used for burning fuel in rockets and spaceships as there is no air in the space.
- Cutting and welding: Oxygen and hydrogen are made to bum in a specially designed torch. The oxyhydrogen flame can easily melt metals and used for cutting and welding them.
- Chemical industry: Oxygen is used in large amount for preparing sulphuric acid from sulphur and nitric acid from ammonia.
(b) Tests for oxygen gas are : - It rekindles glowing wooden splinter.
- If mixed with colorless nitric oxide gas, it forms reddish brown fumes of nitrogen dioxide.
- It dissolves in alkaline pyrogallol solution and turns it brown.
|