Question

the crystal of iodine and slow heating in a closed flask,turns into vapours and fills the complete flask​

Answer 1

Solution. The iodine crystals get converted into the gaseous state from solid-state when they are heated. Gases have a property to fill a container completely, So the iodine vapour fills the container completely.

Answer 2

Solution: The iodine crystal get converted into the gaseous state from solid state when they are heated.