Respuesta :
Iron (II) sulfide can not be separated by physical methods because it is a compound.
A compound is a combination of elements that are chemically combined. The components of a compound can not be separated by physical methods.
A compound is formed during a chemical change so it is not easy to reverse the process and obtain the constituent elements again.
Therefore, the components of Iron (II) sulfide can not easily be obtained again because a compound has been formed.
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