Differences between a federal government and a unitary government is as follows:

a) In a federal form of government, the central government shares its powers with the various Constituent units of the country whereas In unitary form of government either there is only one level of government or the sub-units are subordinate to the central government

b) In the federal form of government, the central government cannot order the state government to do something or take any action whereas the central government can pass on orders to the provincial or the local government

c) Examples of central government are India, USA and Canada

Whereas, examples of unitary government are China, U.K, France