There are some significant differences in the constitution and operation of a federal and unitary administrative structure.
Explanation:
No.1. First of all a federal structure holds regular election which is completely absent in an unitary form of government.
No.2. In most cases, these elections are free and fair and completely open with all round participation in a federal structure.
No.3. Federal form of governments distribute power among the Center and various states.
No.4. Federal governments can dissolve smaller state governments on their will.
No.5. Federal governments share power among the states. This include financial powers and sharing of revenue.