The major differences between a compound and a mixture is/are:

The major differences between a compound and a mixture are: When two or more elements combine chemically, a compound is formed whereas, when two or more substances simply mix together, a mixture is formed and the properties of a compound are completely different from its constituents whereas a mixture retains the properties of its components.

For example- when hydrogen and oxygen combine chemically, a compound called water is formed which shows entirely different properties. The properties of constituents are retained in a mixture. for example - a mixture of iron filings and sulphur.