SSC MTS EXAM

SSC

CHEMISTRY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Which statement is correct about the cleansing action of soap?

A	soap molecules emulsify oil
B	soap reacts with an acid to form salt
C	soap increases the surface tension of water
D	the hydrophobic part of soap molecules dissolves in water

Explanation:

Detailed explanation-1: -The cleansing action of both soaps and detergents results from their ability to lower the surface tension of water, emulsify oil or grease, and hold them in a suspension in water. Hence, Option 1 is correct.

Detailed explanation-2: -An emulsifier is capable of dispersing one liquid into another immiscible liquid. This means that while oil (which attracts dirt) doesn’t naturally mix with water, soap can suspend oil/dirt in such a way that it can be removed. The soap will form micelles (see below) and trap the fats within the micelle.

Detailed explanation-3: -Soap is an excellent cleanser because of its ability to act as an emulsifying agent. An emulsifier is capable of dispersing one liquid into another immiscible liquid. Soap anions emulsifies oil and water.

There is 1 question to complete.