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Is Matter Around Us Pure
16. In what respect does a true solution differ from a colloidal solution and a suspension? How will you test whether a given solution is a colloidal solution or a suspension?
Comparison of properties of solution, colloidal solution and suspension.
|
Property |
Solution |
Colloidal solution |
Suspension |
|
(1) Appearance
|
Homogeneous and transparent
|
Heterogeneous and transluscent |
Heterogeneous and opaque |
|
(2) Particle size
|
< 1 nm (10–7 cm)
|
1 nm—100 nm (10–7 cm—10–5 cm) |
> 100 nm (10–5 cm)
|
|
(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 |
Diffuse rapidly NaCl dissolved in water |
Diffuse slowly Blood |
Do not diffuse Mud water |
Test of a colloidal solution or a suspension.
(i) A colloidal solution is turbid and particles settle down on adding a salt whereas no change is noticed when a salt is added to a true solution.
(ii) If the particles in a heterogeneous and opaque solution can be seen with naked eyes and get settled on keeping, then it is a suspension.
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Which separation techniques will you apply for the separation of the following?
Ammonium chloride from a mixture containing sodium chloride and ammonium chloride.
Which separation techniques will you apply for the separation of the following?
Small pieces of metal in the engine oil of a car.
Which separation techniques will you apply for the separation of the following?
Different pigments from an extract of flower petals.
Which separation techniques will you apply for the separation of the following?
Butter from curd.
Write the steps you would use for making tea. Use the words—solution, solvent, solute, dissolve, soluble, insoluble, filtrate and residue.
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