Q74 of 81 Page 72

Assertion : Colloidal solutions show colligative properties.

Reason : Colloidal particles are large in size.


Colloidal particles are large in size.


Colloidal solutions show colligative properties as the colloidal particles have large size. As a result, colloidal particles have small value of colligative properties because number of particles is small in comparison to normal solution due to their large size.

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72

Match the items of Column I and Column II.

 73

Assertion : An ordinary filter paper impregnated with collodion solution stops the flow of colloidal particles.

Reason : Pore size of the filter paper becomes more than the size of colloidal particle.


 75

Assertion : Colloidal solutions do not show Brownian motion.

Reason : Brownian motion is responsible for stability of sols.


 76

Assertion : Coagulation power of Al3+ is more than Na+.

Reason : Greater the valency of the flocculating ion added, greater is its power to cause precipitation (Hardy Schulze rule).