Question:
Smectite mineral colloid is
Smectite mineral colloid is
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Soil colloids:
Inorganic crystalline = Smectite, Kaolinite, Illite.
Inorganic amorphous = Allophane.
Organic amorphous = Humus.
Inorganic crystalline = Smectite, Kaolinite, Illite.
Inorganic amorphous = Allophane.
Organic amorphous = Humus.
Updated On: Sep 4, 2026
- Organic amorphous colloid
- Inorganic crystalline colloid
- Inorganic amorphous colloid
- Organic crystalline colloid
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Soil colloids are categorized into organic (humus) and inorganic (layer silicate clays and hydrous iron/aluminum oxides) fractions, which are either crystalline or amorphous.
Step 2: Detailed Explanation:
1. Smectite (Montmorillonite group): An inorganic 2:1 phyllosilicate layer clay mineral possessing a well-defined, repeating crystalline lattice structure of silicon-oxygen tetrahedra and aluminum-oxygen octahedra.
2. Allophane and Imogolite: Inorganic amorphous (non-crystalline) colloids.
3. Humus: Organic amorphous colloid.
Therefore, smectite is an Inorganic crystalline colloid.
Step 3: Final Answer:
Hence, smectite mineral colloid is an Inorganic crystalline colloid, corresponding to option (B).
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