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Which of the following statement(s) is/are correct regarding colloids and emulsions?

1. Milk is an oil in water type emulsion
2. Micelle formation takes place above a temperature called kraft temperature (Tₖ)
3. Emulsifying agents are the components used to stabilize emulsions
4. Proteins and heavy metal salts are common emulsifying agents for O/W and W/O emulsions respectively

Correct answer: Emulsifying agents are the components used to stabilize emulsions

Solution

All four statements are actually correct: milk is O/W; micelles form above Kraft temperature; emulsifying agents stabilize emulsions; proteins are used for O/W and heavy-metal soaps for W/O. However, in many standard references 'heavy metal salts' as emulsifying agents for W/O is a specific fact — if the question expects multiple correct answers, A, B, C, D all are correct. For a single-answer format, C is the most universally unambiguous correct statement.

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