Class 12th Chemistry 2017 Set2 Delhi Board Paper Solution

Question 11

Write one difference in each of the following:

1) lyophobic sols and lyophilic sol

2) Solution and Colloid

3) Homogeneous catalysis and Heterogeneous catalysis

Answer

1) lyophobic sols :

They are those solution in which the dispersed phase has no attraction for the dispersion medium or the solvent. For eg. Dispersion of gold, iron & sulphur in water. They cannot be prepared directly they are prepared by special method only. They are easily precipitated by adding small amount of electrolyte.

lyophilic sol :

They are those solution in which the dispersed phase exhibits a definite affinity for the dispersion medium(liquid) or the solvent.For eg. Dispersion of starch, gum, & protein in water.They cen be easily prepared by directly mixing with liquid dispersion medium. They are quite stable and and not easily precipitated.



 

2)  Solution: Solutions are homogeneous mixture of two or more substance and their particle size is less than10-9 m or 1 nm.

Colloid: These are heterogeneous mixture of two or more particles and their particle size is in between 10-9 to 10-6 m.

 

3) Homogeneous catalysis: 

It is the phenomenon in which reactants and catalyst are present in the same phase. 

 

Heterogeneous catalysis

It is the phenomenon in which reactants and catalyst are present in the different phase.

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