Question 16
What happens when sulphur burns in air?
The right answer is the one marked above.
It burns with a blue flame, forming sulphur dioxide gas.
Sulphuric acid is made from sulphur industrially, but it is not what burning produces. Sulphur exists in nature in various forms — brittle yellow crystals and a white powder-like amorphous form — and forms of one element like that are called its allotropes.