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Soil Mechanics and Foundation Engineering - Engineering

Q1:

Pick up the clay soil group which does not swell when wet from the following :

A Kaolinite group

B Illite group

C Vermiculite group

D Montrorillonite group.

ANS:B - Illite group

Kaolinite is stronger than all and doesn't swell made of 1:1 Aluminium and silica of size 7 Angstron A'.
You are wrong, Ionic bond is stronger than hydrogen bond.
Ionic bond>covalent bond>hydrogen bond> dipole-dipole bond> van der wall bond. Answer will be kaolinite as hydrogen bond is present in kaolinite, which is stronger then the ionic bond which is present in illite group.