Question

What happens when lyophilic sol is added to lyophobic sol. prevention from coagulation precipitation emulsion electrophoresis

• A. Prevention from coagulation
• B. Precipitation
• C. Emulsion
• D. Electrophoresis

Answer 1

The Correct Option is A

To understand what happens when a lyophilic sol is added to a lyophobic sol, we need to explore the properties of these colloidal solutions:

• Lyophobic sol: This type of sol is solvent-hating, meaning it does not easily mix with the solvent. Examples include sols formed by metals such as gold or silver in water. These sols are unstable and prone to coagulation.
• Lyophilic sol: This type of sol is solvent-loving, meaning it mixes well with the solvent. Examples include sols formed by substances such as gelatin or starch in water. These sols are stable due to the favorable interaction with the solvent.

When a lyophilic sol is added to a lyophobic sol, the stability of the lyophobic sol is increased. This is due to the fact that lyophilic sols can form a protective layer around the lyophobic particles. This layer prevents the lyophobic particles from coming close together and coagulating.

Therefore, the process is known as protection against coagulation. It stabilizes the lyophobic sol by preventing the particles from aggregating and forming larger particles, which would lead to precipitation.

Now let's consider the options given:

1. Prevention from coagulation: This is the correct option as explained above. The addition of a lyophilic sol helps to stabilize and prevent the coagulation of lyophobic sols.
2. Precipitation: This refers to the process where particles in a solution form a solid. Adding a lyophilic sol would prevent this rather than cause it.
3. Emulsion: This refers to a different type of colloidal system where liquid droplets are dispersed in another liquid. This is not directly related to the interaction of lyophobic and lyophilic sols.
4. Electrophoresis: This is a process involving the movement of dispersed particles under the influence of an electric field. It is not relevant to the stabilization of sols when mixed.

Thus, the correct answer is “Prevention from coagulation” because the lyophilic sol provides an additional layer around the lyophobic sol particles, which prevents them from coming into close contact and coagulating.