Surface Chemistry

What is the term for the accumulation of molecular species at the surface rather than in the bulk of a solid or liquid?

Distinguish between Adsorbate and Adsorbent.

What is Desorption?

What is the term used when both adsorption and absorption take place simultaneously?

What are the signs of $\Delta H$ and$\Delta S$during adsorption?

For adsorption to be spontaneous, what must be the sign of $\Delta G$ ?

What type of forces are involved in Physisorption?

What type of forces are involved in Chemisorption?

Which type of adsorption is specific in nature?

Compare the Enthalpy of Adsorption for Physisorption and Chemisorption.

How does temperature affect Physisorption?

How does temperature affect Chemisorption?

Which type of adsorption forms multimolecular layers?

Why are easily liquefiable gases (high critical temperature) adsorbed more readily in physisorption?

What is the mathematical expression for the Freundlich Adsorption Isotherm?

In the plot of $\log(x/m)$vs$\log P$ for Freundlich isotherm, what does the slope represent?

In the Freundlich isotherm plot, what does the intercept on the y-axis represent?

What is the value of $1/n$ in the Freundlich isotherm at high pressure?

What is the range of values for the factor $1/n$ in Freundlich isotherm?

Define Homogeneous Catalysis.

Define Heterogeneous Catalysis.

In the modern adsorption theory of catalysis, why is desorption of products important?

What is meant by the Activity of a catalyst?

What is meant by the Selectivity of a catalyst?

What are Zeolites chemically?

Why are Zeolites called shape-selective catalysts?

What is the use of the zeolite catalyst ZSM-5?

What are Enzymes?

What are Coenzymes?

What is the optimum temperature range for human enzyme activity?

What is the particle size range of Colloids?

What is a colloidal system of a Solid dispersed in a Liquid called?

What is a colloidal system of a Liquid dispersed in a Solid called?

What is a colloidal system of a Liquid dispersed in a Liquid called?

Differentiate between Lyophilic and Lyophobic colloids based on stability.

What are Multimolecular colloids?

What are Macromolecular colloids?

What are Associated Colloids (Micelles)?

Define Critical Micelle Concentration (CMC).

What is the Kraft Temperature?

What is Peptization?

Which method is used to prepare sols of metals like Gold, Silver, and Platinum?

What is Dialysis?

What is the Tyndall Effect?

State one condition for the Tyndall effect to be observed.

What is Brownian movement?

Why do colloidal particles acquire an electric charge?

Give an example of a Positively charged sol.

Give an example of a Negatively charged sol.

What is Zeta Potential (Electrokinetic Potential)?

What is Electrophoresis?

What is Coagulation or Flocculation?

State the Hardy-Schulze Rule.

Arrange the following ions in increasing order of coagulating power for a negative sol: $Na^+$ , $Al^{3+}$ , $Ba^{2+}$ .

What is the Flocculating Value?

What is meant by Protection of colloids?

What are the two types of Emulsions?

Give examples of emulsifying agents for O/W emulsions.

Give examples of emulsifying agents for W/O emulsions.

How is the delta formed at river mouths?