Adsorption is the phenomenon of attracting and retaining the molecules of a substance on the surface of a solid resulting into a higher concentration on the surface than in the bulk. The substance adsorbed is known as adsorbate and the substance on which adsorption takes place is called adsorbent. In physisorption adsorbate is held to the adsorbent by weak van der Waals forces and in chemisorption by strong chemical bond.

Out of Milk, butter, ice cream, fruit juice and lemonade. Identify the one that is not a colloid.

Lemonade

The correct answer is (2) Lemonade.

Let's delve into the explanations in more detail:

1. Milk:
 Milk is an example of an emulsion, which is a type of colloid.
 It contains fat globules (tiny droplets of fat) dispersed in water.
 The fat globules are suspended in the liquid and do not settle out due to their small size.

2. Lemonade:
Lemonade is typically a true solution. A solution is a homogeneous mixture where one substance (the solute) is dissolved in another (the solvent).
In lemonade, ingredients like lemon juice and sugar dissolve in water, forming a clear and homogeneous mixture.
Since it doesn't involve dispersed particles, lemonade is not a colloid.

3. Fruit Juice:
Fruit juice can vary. Some fruit juices contain particles such as pulp that are dispersed in the liquid.
If the fruit juice contains suspended particles, it may exhibit colloidal properties.
If the juice is clear and homogeneous, it may be more of a solution.

4. Butter:
Butter is an emulsion, making it a colloid.
It consists of water droplets dispersed in a fat matrix.
The fat in butter surrounds and stabilizes the water droplets, preventing them from coalescing or separating.

In summary:
Milk and Butter are colloids. Milk is an emulsion of fat globules in water, and butter is an emulsion of water droplets in fat.
Lemonade is typically a true solution, not a colloid.
Fruit Juice may or may not be a colloid, depending on whether it contains dispersed particles.