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Question

Which of the following statements is/are correct regarding the stability of sol?
(i) Lyophilic sols are stabilized due to a layer of solvent around sol particles.
(ii) Lyophobic sols are stabilised due to presence of charge.
(iii) Addition of lyophilic brings in more stability to lyophobic.
(iv) Addition of lyophobic brings in more stability to lyophobic.

A
(ii) only
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B
(i) and (iv) only
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C
(i), (ii) and (iii) only
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D
All of these.
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Solution

The correct option is B (i), (ii) and (iii) only
  • Lyophilic sols are more stable than lyophobic sols. This is due to the fact that lyophilic colloids are extensively solvated, i.e., colloidal particles are covered by a sheath of the liquid in which they are dispersed.
  • Lyophilic colloids have a unique property of protecting lyophobic colloids.
  • When a lyophilic sol is added to the lyophobic sol, the lyophilic particles form a layer around lyophobic particles and thus protect the latter from electrolytes.
  • Lyophilic colloids used for this purpose are called protective colloids.
  • Hence, option C consisting of the first three statements regarding the stability of sol is the right answer.

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