Among the following, the INCORRECT statement about colloids is:

 

  • Option 1)

    They can scatter light.

  • Option 2)

    They are larger than small molecules and have high molar mass.

  • Option 3)

    The osmotic pressure of a colloidal solution is of a higher order than the true solution at the same concentration.

  • Option 4)

    The range of diameters of colloidal particles is between 1 and 1000 nm.

Answers (1)

 

Colloids -

A colloid is a heterogeneous system in which one substance is dispersed as very fine particles in another substance called disperson medium.

- wherein

The range of diameter is between 1 and 100 nm.

 

 

Multimolecular Colloids -

On dissolution, a large number of atoms or smaller molecules of a substance aggregate together to form species having size in the colloidal range (less than 1 nm). The species thus formed are called multimolecular colloids. E.g. Gold sol, sulphur sol.

-

 

 

Macromolecular Colloids -

Macromolecule in suitable solvent form solutions in which the size of the macromolecules may be in the colloidal range. Such systems are called macromolecular colloids.

- wherein

E.g. starch, cellulose, proteins, enzyme polytheme, nylon, etc. 

 

 

Properties of Colloidal Solutions -

Coagulation or Precipitation

- wherein

The stability of the lyophobic sols is due to the presence of charge on colloidal particles. If somehow the charge is removed the particles will come nearer to each other and settle down under gravity.

 

 

Properties of Colloidal Solutions -

Brownian Movement

- wherein

When colloidal solutions are viewed under a powerful ultramicroscope, the colloidal particles appear to be in a state of continuous zig zag motion all over the field of view. This is known as brownian movement.

 

 

 

the particles in true solution smaller aggregates than those in the colloids. So, the no. of parties in the colloid is lesser in comparison to a true solution of the same connection. Due to this value of colligative properties , like, lowering of V.P, depression in F. P, osmotic pressure, & elevatine in B.P are of small order as compared to the true solution values at same connection.


Option 1)

They can scatter light.

Option 2)

They are larger than small molecules and have high molar mass.

Option 3)

The osmotic pressure of a colloidal solution is of a higher order than the true solution at the same concentration.

Option 4)

The range of diameters of colloidal particles is between 1 and 1000 nm.

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