An example of solid sol is
(a) gem stones
(b) hair cream
(c) butter
(d) paint

Q: Why is butter considered a gel and not a solid emulsion?

Emulsions strictly involve two liquids. Since butter has a liquid (water) dispersed in a solid (fat), it falls under the category of a gel.

Q: Is paint a suspension or a colloid?

Paint is typically a colloidal sol where solid pigment particles are finely dispersed in a liquid medium, though some low-quality paints can have larger particles making them suspensions.

Q: What is the difference between a sol and a solid sol?

In a sol, a solid is dispersed in a liquid (like paint or cell fluids). In a solid sol, a solid is dispersed in another solid (like colored glass or gem stones).

Q: Are all alloys solid sols?

Yes, many solid alloys can be considered solid sols where one solid metal is dispersed within another solid metal lattice, forming a homogeneous-looking solid mixture.

Q: How can I easily remember these classifications?

Create a mental image for each type. For example, for a solid sol, imagine a ruby with tiny solid impurities trapped inside its solid crystal structure.

Question

An example of solid sol is

Options:

(A) gem stones

(B) hair cream

(C) butter

(D) paint

Sigma Percentile · Accepted Answer

### The World of Colloids

Colloids are fascinating mixtures that bridge the gap between true solutions and coarse suspensions. In a colloidal system, one substance is microscopically dispersed throughout another substance. We call the substance being dispersed the **dispersed phase**, and the substance it is suspended in the **dispersion medium**.

Depending on the physical states (solid, liquid, or gas) of these two phases, colloids are classified into various types such as sols, gels, emulsions, aerosols, and solid sols. Understanding this classification is key to solving many conceptual questions in Surface Chemistry.

### Decoding the Options

Let's break down the options provided in the question to identify their colloidal types:

**1. Gem Stones:**
Gem stones, like rubies or sapphires, are beautiful examples of colloids. They consist of tiny metal crystals or oxides (which are **solid**) dispersed throughout a continuous stone medium (which is also **solid**). Because both the dispersed phase and the dispersion medium are in the solid state, gem stones are classified as a **solid sol**.

**2. Hair Cream:**
Hair cream is a cosmetic product made by blending oils and water. Since both the dispersed phase and the dispersion medium are **liquids**, this type of colloidal system is known as an **emulsion**.

**3. Butter:**
Butter is created by churning cream. During this process, tiny droplets of water (a **liquid**) become trapped within a continuous matrix of butterfat (a **solid**). A colloid where a liquid is dispersed in a solid is called a **gel**.

**4. Paint:**
Paint is a mixture used to add color and protection to surfaces. It contains solid pigment particles (the **solid** dispersed phase) suspended in a liquid solvent or binder (the **liquid** dispersion medium). This specific combination is simply referred to as a **sol**.

### The Final Verdict

By systematically analyzing the physical states of the components in each option, we can clearly see that only **gem stones** fit the definition of a solid sol, where a solid is dispersed within another solid.

Memorizing the standard table of colloidal classifications and their common everyday examples is a highly effective strategy for tackling such questions swiftly and accurately in competitive exams.

Animated Solution for Chemistry - Surface Chemistry: An example of solid sol is

Select Answer:

Visualized Solution

$Defining a Solid Sol$

$Analyzing Gem Stones$

$Analyzing Hair Cream$

$Analyzing Butter$

$Analyzing Paint$

$Final Conclusion$

$The Way Forward$

The Sigma Insight: Colloids, Micelles and and Emulsions

The World of Colloids

Decoding the Options

The Final Verdict

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