Which of the following is true in respect of adsorption?

Which one of the following forms an intrinsic colloid?

In Freundlich adsorption isotherm, the value of 1/n is

What is meant by 'shape-selective catalysis' of reactions?

How does it become possible to cause artificial rain by spraying silver iodide on the clouds?

(a) What happens when a freshly precipitated Fe(OH)₃ is shaken with water containing a small quantity of FeCl₃?
(b) Why is finely divided substance more effective as an adsorbent?

Why does physisorption decrease with the increase of temperature?

What is demulsification? Name two demulsifiers.

How are the following colloidals different from each other in respect of their dispersion medium and dispersed phase? Give one example of each.

(i) Aerosol

(ii) Emulsion

(iii) Hydrosol

What is the difference between physisorption and chemisorption?

Describe the following processes:
(i) Dialysis,
(ii) Electrophoresis,
(iii) Tyndall effect.

Radha and Meera are fast friends. They both study in class XII.Radha is a student of science while Meera follows commerce stream. One day, when they were playing, Radha got hurt and started bleeding. Meera took her to house and applied some alum on the cut. The bleeding stopped immediately.
(i)Why bleeding stopped when some alum is applied on the cut?
(ii) What are the values associated with Meera's decision to take Radha to her house and apply alum on her cut?

A one  - litre vessel contained a gas at 27^oC. 6 g of charcoal was introduced into it. The pressure of the gas fell down from 700 mm to 400 mm. Calculate the volume of the gas (at S.T.P) adsorbed per gram of charcoal. Density of charcoal sample used was 1.5 g cm^-3 .