Why is mars visible from earth in the night sky

You can see mars in the night sky because it is a very bright planet. Mars is as bright, or brighter than the stars. Yes, all planets are pretty bright, but mars in beyond bright along with jupiter, mercury, etc. Hope this helped! :)

The dispersed phase is liquid and dispersed medium in milk is liquid

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).