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 interactions 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
Answer
Answer: B ✓ checked by 4AB · confidence high
The source book printed A; on checking, B is correct — see the explanation.
Explanation
Curve (a), purely repulsive, is the double layer (2). Curve (b), with a barrier and a deep well, is the combined DLVO curve (3). Curve (c), purely attractive, is van der Waals (1). Order 2, 3, 1 (b).