Question

Suspensions have solute particles with size less than 1 nm.
A. True
B. False

Answer 1

Hint:In order to proceed, we first need to understand the basic concept of mixtures and how to differentiate between them. Mixtures can be classified on the basis of particle size into three different types: solutions, suspensions, and colloids. Some distinguishing features of the three are discussed below.

Complete answer:
Now we can list out the characteristic of solutions as,
-The solute molecules in a true solution are not visible, even with a powerful microscope.
-The particle size is below 1 nm in diameter.
-A true solution forms a homogeneous mixture.
-The particles of the solute in a true solution can pass through a parchment membrane.
-The solute molecules in a true solution can pass through even fine filter paper.
-The osmotic pressure exerted by the solution is relatively more.
-When a strong beam of light is thrown on a true solution, the path of light is not illuminated.
-The solution does not possess the property of adsorption (a surface phenomenon).
-No electrical properties such as electro osmosis, cataphoresis and coagulation are observed.
Now we can discuss about the features of suspensions as,
-The particles are so big that they are visible even with naked eye.
-The particle size is above 100 nm in diameter.
-Suspension is completely a heterogeneous mixture.
-The particles of the solute in a suspension cannot pass through a parchment membrane.
-The suspended particles are retained even by ordinary filter paper.
-No osmotic pressure is observed.
-No Tyndall effect is observed.
-The phenomenon of adsorption is much less marked.
-No such electrical properties are exhibited.
Now we can see the behaviour of colloids:
-The molecules of the dispersed phase cannot be seen with naked eye. However they can be made visible through a powerful microscope.
-The particle size is 1 -100 nm in diameter.
-A Colloidal Solution is heterogeneous.
-The particles of a colloidal solution cannot pass through a parchment membrane.
-The colloidal particles can also pass through ordinary filter paper, but cannot pass through filter paper called ultrafilters.
-Colloidal solutions exert a very low osmotic pressure.
-The path of light is visible due to scattering of light when a strong beam of light is passed through a colloidal solution.
-Colloidal solutions possess remarkable properties of adsorption.
-Colloidal solutions exhibit these electrical properties to a great extent.
-As stated in rule number 2 that solutions have solute particles with size less than 1 nm whereas suspensions have size more than 100 nm and colloids have size between 1 to 100 nm. Thus, the statement Suspensions have solute particles with size less than 1 nm is False.
Hence, option B is the correct answer.

Note:
From the above we discussed the differences between the types of mixtures. This can be used to judge any statement about these types of mixtures. Understanding each of the basic differences between the three is of utmost importance to judge any kind of a mixture. Practically, just by looking at the mixture, one can have a rough idea as to whether the mixture is a solution, suspension or a colloid.