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Question
Which of the following shows the correct order of increasing surface areas of the given soil
fuEufyf[kr esa ls dkSulk nh xbZ feðh ds c<+rs lrg {ks=ksa dk lgh Øe n'kkZrk gSA
A.
Clay < silt < sand < colloids
B.
Gravel < silt < colloids < clay
C.
Sand < silt < clay < colloids
D.
Silt < gravel < colloids < clay
Answer ( Option C)

Sand < silt < clay < colloids

Solution

The specific Surface area is inversely proportional to grain size. Out of sand, silt, clay and colloids.Sand has the highest grain size while colloids have the least grain size.
For coarse sand  2 mm < d ≤ 4.75 mm
    For fine sand  0.075 mm < d  ≤ 0.425 mm 
    For silt  → 0.002 mm < d ≤ 0.075 mm
    For clay → < 0.002 mm 
Colloids are basically finer clay particles whose surface area is so high that its behaviour is controlled by specific energy rather than mass-energy.
 Increasing order of surface area  sand < silt < clay < colloids
 

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