Pumice stone is an example of

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Question

Pumice stone is an example of

Accepted Answer

Correct Answer: C — Solid solStep-by-step Solution:To classify a colloidal system, identify the dispersed phase and the dispersion medium:Pumice stone: This is a volcanic rock formed when rapidly cooling lava traps gas bubbles within the solidifying rock. It is a colloidal system where the dispersed phase is gas (trapped air/volcanic gases) and the dispersion medium is solid (the rock matrix). This type of colloidal system is called a solid sol (gas dispersed in solid).Why other options are wrong:Option A — Sol: Solid dispersed in liquid. Examples: gold sol, starch sol, paints. Pumice is not liquid → not a sol.Option B — Gel: Liquid dispersed in solid. Examples: cheese, boot polish, butter. The dispersed phase in pumice is gas, not liquid → not a gel.Option D — Foam: Gas dispersed in liquid. Examples: shaving cream, whipped cream, froth on beer. Dispersion medium in pumice is solid, not liquid → not a foam.Key Concepts — Classification of Colloids:Dispersed PhaseDispersion MediumNameExamplesGasLiquidFoamWhipped cream, frothGasSolidSolid solPumice stone, glass foamLiquidGasAerosolFog, clouds, mistLiquidLiquidEmulsionMilk, cold creamLiquidSolidGelCheese, butter, jellySolidGasAerosolSmoke, dustSolidLiquidSolGold sol, muddy waterSolidSolidSolid solGems, coloured glass, some alloys

Pumice stone is an example of

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Pumice stone is an example of

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