Filtration as a method of separation can be used for mixtures that are:
A) Homogeneous and liquid-in-gas mixtures
B) Heterogeneous and liquid-in-liquid mixtures
C) Homogeneous and solid-in-liquid mixtures
D) Heterogeneous and solid-in-liquid mixtures

Hint:Filtration can be defined as a process of separation of solids from gases or liquids by using a filter medium that allows the liquid or fluid to pass but not the solid. One can apply the idea of filtration to given options and make the correct choice.

Complete step by step answer:Firstly, we will learn about the concept of filtration which will give us an idea to solve the question. Filtration is a process in which the solid suspended matter can be separated from the liquid by the means of a membrane having pores causing the liquid particles to pass. The most common example of filtration in daily life is making tea where a sieve is used for the separation of tea leaves from water.
Filtration process gives best results when the solute particles are not soluble in solvent. For example, the solution of sand in water can be separate through this method because both the compounds do not dissolve with each other. However, the solution of sugar in water cannot be separated through this method because sugar is soluble in water.
This method is useful in the field of research laboratories, in controlling environmental pollution, in industrial processes. Municipalities use this filtration process when purifying water and treating sewage.
Hence, filtration method can be used for the separation of mixtures that are heterogeneous and solid-in-liquid mixtures.


Note:It is important to remember that only the heterogeneous mixtures can be separated by this method. There are some disadvantage of filtration i.e. filtration done in batches so it is very time consuming and expensive.