Q.

Which type of colloid is shaving cream?

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a

Emulsion

b

Aerosol

c

Foam

d

Gel

answer is C.

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Detailed Solution

Colloidal solutions (or colloids) are those in which the size of particles is not visible to naked eyes but they can scatter the beam of light.

Colloids are classified on the basis of the physical states of the dispersed phase snd the dispersing medium.

When the dispersed phase is gas and the dispersing medium is a liquid, then such colloid is referred to as a foam.

Shaving cream is a gas dispersed in liquid medium. Thus, shaving cream is a foam.

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