Question

Which of the following is not a colloid?
A) Foam
B) Cloud
C) Rooh Afza syrup
D) Egg

Answer 1

Hint: A suspension of very fine divided particles into a continuous medium from which the particles do not get settled out quickly and are not filtered out is called as a colloid.

Complete answer:
Colloids consist of gels, sols, and emulsions the particles do not settle, and can't be separated out by regular filtering or centrifuging like those in a suspension method.
In chemistry, a colloid is a section separated combination wherein one substance of microscopically dispersed insoluble or soluble particles is suspended all throughout another substance. Sometimes the dispersed substance alone is known as the colloid.
An emulsion is a unique form of colloid made up from an aggregate of liquids which shape to form a solid substance that has extraordinary physical unique properties. Colloids may be made from gas with liquid, liquid with liquid, solid with liquid or solid with gas.
Rooh Afza solution is a homogeneous mixture of rooh afza in water. So it is not a colloid and Foam, cloud and Egg are colloidal solutions.

So the correct answer is (C).

Note: Colloids also consist of Brownian movement or motion, this is a random zig-zag motion of colloid type of particles that can be seen under a regular microscope and happens when particles collide with each other in the dispersing medium ( for the example air, water ).