What kind of mixtures can be separated by filtration?

Solution 14E: Matter is generally classified according to (i) physical state (ii) By using its composition Homogeneous matter/mixture is uniform and continuous whereas heterogeneous consist of two or more phase having non-uniformity and discontinuity about the properties and appearance. Pure substance refers to the matter which has distinct set of properties that are common to all other samples to that substance. A mixture consists of two or more substance which has a wide range of properties are depending on the relative amounts of the components present in the mixture. (a) air, Air is a mixture of nitrogen, oxygen and some other gases. The properties and appearance all individual element nitrogen , oxygen and other gases in air are uniform like pure individual element.That is way, air is considered as omogeneous mixture. (b) tomato juice It is juice obtained from tomato along with water and salt. It is a mixture and which do not have uniform properties in solution phase. That is way, tomato juice is heterogeneous mixture. (c) iodine crystals It is a iodine molecule and it has a homogeneous in form. Therefore, it has uniform properties. So it is a pure substance. (d) sand Sand is a granular material composed of finely divided rock and mineral particles. Therefore, the properties of sand is varies depending on the conditions. So it is a heterogeneous mixture.