Question

In which of the following particle size is equal to or greater than 100nm? CuSO4 + Water Mud + Water Alum + Water Sand + water

Answer 1

Answer and Explanation:

$\diamond$ Mixtures or solutions having particle size greater than 100 nm are called as suspensions

$\diamond$ Suspensions on keeping undisturbed for a little while settles down the particles

$\diamond$ There mostly is a phase difference between the particles and the medium

$\diamond$ Some examples of suspensions are :

1. Starch in water
2. Mud in water
3. Sand in water

$\diamond$ In the given options :

1. CuSO₄ in water produces a homogenous solution having particles size less than 100nm

2. Mud in water produces a suspension having particle size more than 100nm

3. Alum in water may or may not form suspensions because, it depends on the type of alum

For eg : sodium alums are soluble whereas, caesium and rubidium alums are sparingly soluble in water

4. Sand in water produces a suspension having particle size more than 100nm