Suspension

Concept Explanation

Suspension

A suspension is a heterogeneous mixture in which small particles of a solid remain suspended throughout the mass of the liquid or gas. For example, mud, sand and chalk particles remain suspended in water. Solid particles may remain suspended even in a gas. These mixtures are called suspensions.

Examples: Muddy water, sand - water mixture, chalk - water mixture, paints, etc., are suspensions.

Properties of suspensions :-

A suspension is a heterogeneous mixture.

The particles in a suspension are large enough to be visible either to the unaided eye or under an ordinary microscope.

The particles in a suspension are too large to remain in suspension for a long period. Further, the intermolecular forces between the particles are not so strong as to keep them suspended. So, if a suspension is allowed to stand, the suspended particles may settle down at the bottom.

The particles in a suspension can be separated from the liquid by filtration.

In a suspension, the size (diameter) of the particles is of the order of $large 10^-^5$ cm or larger.

They show tyndall effect.

Comparison of properties of solution, colloidal solution and suspension:-

Properties	True solution	Colloidal solution	Suspension
1. Appearance	Homogeneous and transparent	Heterogeneous and translucent	Heterogeneous and opaque
2. Particle size	$<1nm(10^-^7cm)$	$1nm-100nm$ $(10^-^7cm-10^-^5cm)$	$>100nm(10^-^5cm)$
3. Visibility	Particles are not visible even with a powerful microscope.	Particles can be seen with a high power microscope.	Particles can be seen with naked eyes.
4. Stability	Stable	Stable	Unstable
5. Diffusion	Diffuses rapidly	Diffuses slowly	Does not diffuse
6. Brownian Motion	Shows no Brownian motion	Shows Brownian motion	Shows no Brownian motion
7. Example	NaCI dissolved in water	Blood	Mud water

Sample Questions

(More Questions for each concept available in Login)

Question : 1

Which of the following statements is true about the suspensions?
A. The solute particles can be separated by the process of filtration	B. Starch solution is an example of suspension	C. Suspension is a homogenous mixture	D. Particles in a suspension do not settle down when kept undisturbed
Right Option : A
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Question : 2

A suspension is a ________________ in which small particles of a solid remain suspended throughout the mass of the liquid or gas.
A. Mixture	B. Homogeneous mixture	C. Heterogeneous mixture	D. None of these.
Right Option : C
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Question : 3

Which of the following are correct: (a) A suspension is a heterogeneous mixture. (b) The particles in a suspension can be separated from the liquid by filtration. (c) In a suspension, the size (diameter) of the particles is of the order of 10^-5cm or larger.
A. Only (a) and (b) are correct.		B. Only (b) and (c) are correct.
C. Only (a) and (c) are correct.		D. All of these.
Right Option : D
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