Join 60,000+ competitive exam aspirants
or with email
Your Cart
SubtotalтВ╣0
TotalтВ╣0
Examoogle тАв User тАв info@examoogle.com тАв EE-2024-8821
Chapter 1 of 12 тАв Page 1 of 248ЁЯФТ Protected PDF тАв Watermarked
Join 60,000+ competitive exam aspirants
In colloids, which of the following is a correct example of foam?
Pumice
Mist
Jelly
Fog
Pumice
Pumice is a type of volcanic rock that is classified as a foam because it consists of a solid matrix (dispersed phase) trapping large amounts of gas bubbles (dispersion medium). In this colloidal system, gas is dispersed in a solid, forming a solid foam.
Pumice is a type of volcanic rock that is classified as a foam because it consists of a solid matrix (dispersed phase) trapping large amounts of gas bubbles (dispersion medium). In this colloidal system, gas is dispersed in a solid, forming a solid foam.
Think of a bath sponge or solidified soap lather, where air pockets are trapped inside a solid framework.
Pumice is a porous rock = Gas trapped in Solid (Solid Foam).
Colloid=Dispersed┬аPhase+Dispersion┬аMedium
Solid┬аFoam=Gas┬а(Dispersed)+Solid┬а(Medium)
Colloids are classified based on the physical state (solid, liquid, or gas) of the dispersed phase and the dispersion medium. Foam is a colloidal dispersion where gas is the dispersed phase and solid (or liquid) is the dispersion medium. In pumice, rapidly cooling volcanic lava traps gas bubbles escaping from the molten rock, resulting in a solid foam structure.
Pumice is a lightweight, porous volcanic rock formed when gas-rich frothy lava solidifies rapidly.
It acts as a solid foam because gas bubbles are trapped inside a solid matrix.
Mist and fog are aerosols (liquid in gas).
Jelly is a gel (liquid in solid).
Pumice is extremely lightweight and abrasive, making it useful in personal care and construction.
Used in exfoliating skin products (pumice stone)
Used as an abrasive in polishing and lightweight concrete manufacturing
Option A (Pumice): Solid foam (Gas in Solid)
Option B (Mist): Aerosol (Liquid in Gas)
Option C (Jelly): Gel (Liquid in Solid)
Option D (Fog): Aerosol (Liquid in Gas)
A is correct тАФ Pumice is a solid foam in which gas is dispersed in a solid medium.
Memorize the table of 8 types of colloidal systems based on dispersed phase and dispersion medium, as questions from foam, gel, emulsion, and aerosol are very common in competitive exams.
Get instant step-by-step AI explanations, full shift Previous Year Papers (SSC GD, RRB, SSC JE), and regional rank analysis on the official Examoogle App.
Free Download тАв 100K+ Aspirants