Under review — part of this question (a structure or an option) is not clear in the source scan. 4AB is checking it against the original book; the answer shown may change.
Energy of interaction of colloidal particles as a function of distance of separation can be identified as (1) vander Waals, (2) double layer, (3) vander Waals and double layer. The correct order of interac tions in the figure corresponding to curves (a), (b) and (c), respectively, is
(a)1, 2, 3
(b)2, 3, 1
(c)3, 1, 2
(d)1.3, 2 The attractive energy due to vander walls interaction is inversely propotional to the sixth power of the interatomic distance . i.e $G_{a}=\frac{-\beta}{r^{6}}$
Answer
Under review — not yet confirmed.
Answer: B
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
Curve (a) is purely repulsive (double layer, 2). Curve (b) combines both, with a minimum and a barrier (3). Curve (c) is purely attractive (van der Waals, 1). Order 2, 3, 1 (b).