Question

Write the names of two lyophilic and two lyophobic colloids.

Hint:

Lyophilic = stable and reversible, Lyophobic = unstable and irreversible.

Answer 1

Step 1: Understanding lyophilic colloids.
Lyophilic colloids are "liquid-loving" colloids that form readily when mixed with the dispersion medium. They are stable and reversible in nature. Examples: starch sol, gum sol.
Step 2: Understanding lyophobic colloids.
Lyophobic colloids are "liquid-hating" colloids that do not form readily and require special methods for preparation. They are less stable and irreversible. Examples: ferric hydroxide sol, gold sol.
Step 3: Conclusion.
Thus, starch sol and gum sol are lyophilic colloids, while ferric hydroxide sol and gold sol are lyophobic colloids.