Question

A mixture of sand and water is an example of
(a) Homogeneous mixture
(b) Heterogeneous mixture
(c) Compound
(d)None of these

Answer 1

Hint: In this type of mixture the solute is sand and the water is solvent and the solute does not get dissolved in the solvent but forms two different layers of components after settling down.

Correct answer:
A mixture of sand and water is the best example of heterogeneous mixture. A mixture in which the composition is not uniform throughout the mixture then it is said to be a heterogeneous mixture. After mixing a heterogeneous mixture they do not mix evenly and its components settle down forming two or more separate layers. Each of these layers is called phases. When solid sand is mixed with liquid water it does not get dissolved in it, but when it settles after a while it forms two different phases.

Additional Information:
-A heterogeneous mixture can be classified into three different types based on the size of the components. These are solutions, suspensions, and colloids.
-A solution is said to be a homogeneous mixture with tiny particles. The particles are too small to be seen through our naked eye and also too small to settle or be filtered out of the mixture.
-When the salt is nicely mixed into the water in a glass, it will form a solution. In that solution the salt will no longer be visible in the water, and even it won't settle to the bottom of the glass because it is thoroughly dissolved in water.
-A homogeneous mixture with medium-sized particles is known as colloid.
-A heterogeneous mixture with large particles is known as suspension.
-The bottle filled with salad dressing is an example of a suspension. It is a mixture of oil, vinegar, herbs, and spices. The mixture of salad dressing will separate into its parts if the bottle sits undisturbed for very long. That is why it is preferred to shake the bottle before use.

Note:
-In colloids the particles are large enough to see but not that large to settle or be filtered out of the mixture.
-In suspension the particles are large enough to see and also to settle or be filtered out of the mixture.
-In heterogeneous mixture the components do not get mixed thoroughly but in homogeneous mixture the components are mixed thoroughly.