Which type of liquid mixture solutions are separated by fractional distillation?

Which type of liquid mixture solutions can be separated by simple distillation?

Which type of mixture air is ?

What is the type of air mixture ?

What types of mixture are separated by the technique of crystallisation ?

What are the types of mixtures ?

Why water cannot be separated completely from ethanol by fractional distillation?

Which condition is necessary for destructive distillation?

Components of a binary mixture of two liquids A and B were being separated by distillation. After some time separation of components stopped and composition of vapour phase becomes same as that of liquid phase. Both the components started coming in the distillate. explain why this happened.