Which of the following is incorrect for physisorption?

(a)

reversible

(b)

increases with increase in temperature

(c)

low heat of adsorption

(d)

increases with increase in surface area

Hair cream is _____.

(a)

gel

(b)

emulsion

(c)

solid sol

(d)

sol.

The phenomenon observed when a beam of light is passed through a colloidal solution is_______.

(a)

Cataphoresis

(b)

Electrophoresis

(c)

Coagulation

(d)

Tyndall effect

Collodion is a 4% solution of which one of the following compounds in alcohol – ether mixture?

(a)

Nitroglycerine

(b)

Cellulose acetate

(c)

Glycoldinitrate

(d)

Nitrocellulose

If x is the amount of adsorb ate and m is the amount of adsorbent, which of the following relations is not related to adsorption process?

(a)

x/m = f(P) at constant T

(b)

x/m = f(T) at constant P

(c)

P = f(T) at constant x/m

(d)

x/m = PT

Give two important characteristics of physisorption.

Differentiate physisorption and chemisorption.

Which will be adsorbed more readily on the surface of charcoal and why? NH₃ or CO₂?

Heat of adsorption is greater for chemisorptions than physisorption. Why?

Thermal decomposition of KClO₃  in presence of MnO₂ proceeds as follows.
Steps in the reaction 2KClO₃  → 2KCl + 3O₂ can be given as

Formation of water due to the reaction of H₂ and O₂ in the presence of Cu proceeds as follows. Steps in the reaction H₂ + 1/2O₂ → H₂O can be given as

What happens when a colloidal sol of Fe(OH)₃ and As₂S₃ are mixed?

What is the difference between a sol and a gel?

Why are lyophillic colloidal sols are more stable than lyophobic colloidal sol.

Addition of Alum purifies water. Why?

What are enzymes? Write a brief note on the mechanism of enzyme catalysis.

Describe some feature of catalysis by Zeolites.

Explain any one method for coagulation.

Explain intermediate compound formation theory of catalysis with an example.

Describe adsorption theory of catalysis