MS.Seeta, a science teacher gave different mixtures to four groups of students to separate their components. Which group was not following the correct method ?

Group - 1 : Was separating a mixture of ethyl alcohol and water by using separating funnel

Group - 2 : Was separating a mixture of ammonium chloride and sodium chloride using sublimation

Group - 4 : Was separating mud particles suspended in water using sedimentation and decantation.

Group - 3 : Was separating a mixture of iron pins and sand by using a magnet