Q). Are all mixtures useful to us?                  

Dear Student
Not necessarily,  mixture  may comprise of one or more form of matter. Separation of  mixture  into its individual components may be  useful  it depends upon whether component we are separating is of use to us or not. For eg. separation salt from water is useful to us but at  same  time other components lying in water may not be of use.
Hope this information will clear your doubts about the topic.

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