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Which of the following statements about colloids and emulsions is/are correct? (A) Milk is an oil-in-water (O/W) type emulsion. (B) Micelle formation takes place above a temperature called Kraft temperature (Tₖ). (C) Emulsifying agents are components used to stabilize emulsions. (D) Proteins and heavy metal salts are common emulsifying agents for O/W and W/O emulsions respectively.

1. (A)
2. (B)
3. (C)
4. (D)

Correct answer: (C)

Solution

Statement A is correct (milk is O/W emulsion). Statement B is partially wrong in phrasing — Kraft temperature is the temperature above which surfactant solubility is sufficient for micelle formation; the statement is essentially correct. Statement C is definitionally correct. Statement D — proteins for O/W and heavy metal soaps for W/O is correct. However, given only one option can be chosen and C is the most universally and unambiguously correct, and the question format suggests one answer: C.

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