Which of the following is an example of gas-solid foam type of colloid?
Show answer & explanation
Correct answer: D
Explanation
Correct Answer:
Option 4 (Sponge)
Explanation:
When gas particles are dispersed in a solid medium, it is called a 'solid foam'. Sponge is the perfect example because it contains air (gas) within a solid structure. Other examples include pumice stone and foam rubber.
Analysis of Options:
Milk: This is an 'emulsion', where liquid is dispersed in a liquid.
Fog: This is an 'aerosol', where liquid particles are present in a gas.
Milk of Magnesia: This is a 'sol', where solid particles are present in a liquid.
Possible Questions for the Upcoming Exam:
What type of colloids are butter and cheese?
(Answer: Gel)
Clouds and smoke fall into which category?
(Answer: Aerosol)
What is the scattering of light by colloidal particles called?
(Answer: Tyndall Effect)