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Question

In which of the following colloids is the dispersing medium a liquid?

This question was previously asked in
CDS 2 2024 Maths Question Paper (01-Sep-2024)
The correct answer is
Foam

Colloid Classification: Dispersing Medium as Liquid

Colloids are a fascinating type of mixture where tiny particles of one substance are spread evenly throughout another substance. To understand colloids better, we look at two main parts: the dispersed phase and the dispersing medium.

Key Concepts: Dispersed Phase and Dispersing Medium

  • Dispersed Phase: This is like the solute in a solution; it's the substance that gets broken down into small particles and spread out.
  • Dispersing Medium: This is like the solvent in a solution; it's the substance that the dispersed phase is scattered within.

The question specifically asks us to identify a colloid where the dispersing medium is a liquid. Let's analyze the common types of colloids and the options provided.

Analyzing Common Colloid Types

Here's a breakdown of different colloid types, including their dispersed phase, dispersing medium, and common examples:

Colloid Type Dispersed Phase Dispersing Medium Example
Mist (Type of Aerosol) Liquid droplets Gas Fog, Clouds, Hair spray
Foam Gas bubbles Liquid Whipped cream, Soap lather, Marshmallow
Jelly (Gel) Liquid Solid Gelatin dessert, Jam, Cheese
Shaving Cream (A specific Foam) Gas bubbles Liquid (Water/Soap base) Shaving cream foam

Evaluating the Options Provided

Now let's apply this knowledge to the options given in the question:

  • Mist: In mist, tiny liquid droplets are dispersed in a gas. Therefore, the dispersing medium is Gas. This doesn't fit our requirement.
  • Foam: Foam consists of gas bubbles trapped within a liquid. This means the dispersed phase is gas, and the dispersing medium is Liquid. This perfectly matches the condition.
  • Jelly: A jelly is typically a gel, where a liquid is dispersed within a solid matrix. The dispersing medium here is Solid. This does not meet the criteria.
  • Shaving cream: Shaving cream is a practical example of a foam. It contains many small bubbles of gas dispersed within a liquid soap solution. Thus, its dispersing medium is Liquid.

Both 'Foam' and 'Shaving cream' have a liquid dispersing medium. However, 'Foam' represents the general category of colloids defined by having a gas dispersed in a liquid. 'Shaving cream' is a specific example that belongs to the 'Foam' category. In the context of classifying colloid types, 'Foam' is the fundamental classification that fits the description.

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