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A fine grained soil is found to be plastic in the water content range of 26-48%. As per Indian Standard Classification System, the soil is classified as

1. CL
2. CH
3. CL-ML
4. CI

Correct answer: CI

Solution

The soil is plastic from 26% to 48% water content, so the liquid limit is 48%. Since 35% < LL < 50%, the IS classification is CI (clay of intermediate plasticity), not CH (which requires LL > 50%).

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