Step 1: Definition of an emulsion.
An emulsion is a colloidal mixture where one liquid is dispersed in another liquid with which it is immiscible. Examples of emulsions include milk and mayonnaise.
Step 2: Explanation of options.
Butter: Butter is a colloid but not an emulsion; it is a water-in-fat dispersion.
Mist: Mist is an example of an aerosol, not an emulsion.
Milk: Milk is an emulsion where fat globules are dispersed in water.
Jellies: Jellies are examples of gels, not emulsions.
Step 3: Conclusion.
Among the given options, milk is the correct example of an emulsion.
The gold number range of some of the lyophilic colloids is given below:
A: 0.005 - 0.01, B: 0.15 - 0.25, C: 0.04 - 1.0, D: 15 - 25.