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The standard plasticity chart for the classification of a fine-grained soil is shown in the figure. As per the Indian Standard soil classification system, X represents

1. inorganic clay with medium plasticity
2. inorganic silt with medium plasticity
3. inorganic clay with high plasticity
4. inorganic silt with high compressibility

Correct answer: inorganic silt with medium plasticity

Solution

In the Indian Standard plasticity chart, soils below the A-line are silts, while those above it are clays. The location of X corresponds to inorganic silt with medium plasticity.

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