Question

Which of the following is an emulsifier ?

• A. Soap
• B. Oil
• C. NaCl
• D. Water

Hint:

Soap molecules have hydrophilic (water-attracting) and hydrophobic (water-repelling) ends, which enable them to act as emulsifiers.

Answer 1

The Correct Option is A

Step 1: Define emulsifier.
An emulsifier is a substance that helps in the formation of an emulsion, a mixture of two immiscible liquids like oil and water. It stabilizes the mixture by reducing the surface tension between the two liquids.
Step 2: Analyze the options.
- Soap (Option A) is an emulsifier because it contains both hydrophobic and hydrophilic parts, allowing it to form emulsions between oil and water. - Oil (Option B) is not an emulsifier, as it is part of the mixture but does not help in stabilizing the emulsion. - NaCl (Option C) is a salt and does not have emulsifying properties. - Water (Option D) is a solvent and does not act as an emulsifier.
Step 3: Apply to the options.
The correct answer is (A) Soap.
Final Answer: \[ \boxed{\text{Soap}} \]