* Elements are pure substances made up of only one type of atom (like carbon, oxygen, or hydrogen).

* Compounds are formed when two or more elements chemically combine in a fixed ratio (like water, H₂O, or carbon dioxide, CO₂).

* Mixtures are combinations of two or more substances that are not chemically bonded. They can be separated by physical means.

Coke is a mixture because it contains:

* Carbon: The main component, derived from coal.

* Other elements: In smaller amounts, like sulfur, hydrogen, nitrogen, and oxygen.

These components aren't chemically bonded in a fixed ratio. Coke can be made from different types of coal, and its composition can vary. You can even separate the components of coke using physical methods like heating or dissolving.