In soil physics and colloidal science, an idealized porous packing model consisting of uniform particles of identical shape and diameter is designated as a monodisperse system.
Natural agricultural soils containing a wide distribution of particle sizes (sand, silt, and clay) are polydisperse systems. (Correct answer: Option 1)
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2
ICAR JRF Agricultural Physics 29 Jun 2024Shift 1
MCQ (Single Correct)+4−1
What is the coordination number of cubic tetrahedral type packing of soil spherical particles?
Specific surface area ($S_w$) is inversely proportional to particle diameter ($S_w = \frac{6}{\rho \cdot d}$).
Coarse sand grains ($0.05 - 2.0\text{ mm}$) have very small surface areas per unit mass, typically $\lt 2\text{ m}^2/\text{g}$ (often $0.01 - 0.1\text{ m}^2/\text{g}$), compared to $10 - 40\text{ m}^2/\text{g}$ for illite and up to $800\text{ m}^2/\text{g}$ for smectite clay. (Correct answer: Option 2)
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Formulated by Stephen Brunauer, Paul Hugh Emmett, and Edward Teller.
Extends Langmuir's monolayer adsorption model to describe multilayer physical gas adsorption on porous solid surfaces, serving as the international standard method for measuring specific surface area of soil clays. (Correct answer: Option 2)
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