Which of the following is true in respect of adsorption?

Which one of the following forms an intrinsic colloid?

Which of the following electrolytes will be most effective in the coagulation of gold sol?

The correct ascending order of adsorption of the following gases on the same mass of charcoal at the same mass of charcoal at the same temperature and pressure is

Which of the following relation is correct ?
(i) x/m = constant at high pressure
(ii) x/m = constant xp^1/n (at intermediate pressure)
(iii) x/m = constant xpⁿ (at lower pressure)

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

What is meant by chemisorption?

Define the term 'Tyndall effect'.

What is meant by critical micelle concentration?

Increasing the adsorbing power of an adsorbent by subdividing it is called...............of the solid adsorbent.

Adsorption of N₂ gas on iron at 83 K is........where as at 773 K, it is.....................(fill in the type of adsorption).

(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?

Describe a chemical method each for the preparation of the sols of sulphur and platinum in water.

Which of two He and Ne, gets adsorbed on the surface of charcoal more readily, and why?

Draw a plot of variation in quantity of gas adsorbed \(\left( \frac { x }{ m } \right) \) with the pressure of the gas. Also plot the graph between log  \(\frac { x }{ m } \) vs log p at constant temperature. What is slope of this line?

(a) What are the two types of emulsions and how do they differ from one another? Give one example of each.
(b) Which one of the following electrolytes is most effective for the coagulation of Fe(OH)₃ sol and why?
NaCl, Na₂ SO₄ , Na₃ PO₄

(a) Which will adsorb more gas, a lump of charcoal or its powder and why?
(b) Describe the preparation of the following colloidal solutions. Name the method used in each case:
(i) Silver sol
(ii) Sulphur sol

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?

20% of surface sites are occupied by N₂ molecules. The density of surface sites is \(6.023\times { 10 }^{ 14 }\) cm^-2 and total surface area is 1000 cm² . The catalyst is heated to 300 K while N₂ is completely disorbed into a pressure of 0.001 atm and volume 2.46 cm³. Find the active sites occupied by each N₂ molecule.