Surface Chemistry · Question 10

Which one of the following characteristics is associated with adsorption?

1. G and H are negative but S is positive.
2. G and S are negative but H is positive.
3. G is negative but H and S are positive.
4. G, H and S all are negative.

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As2S3 are given below : I. (NaCl) = 52, II. (BaCl2) = 0.69, III. (MgSO4) = 0.22 The correct order of their coagulating power is

1. I > II > III
2. II > I > III
3. III > II > I
4. III > I > II

Which property of colloidal solution is independent of charge on the colloidal particles?

1. Electro-osmosis
2. Tyndall effect
3. Coagulation
4. Electrophoresis

Which of the following statements is correct for the spontaneous adsorption of a gas?

1. is negative and, therefore, should be highly positive.
2. is negative and, therefore, should be highly negative.
3. is positive and, therefore, should be negative.
4. is positive and, therefore, should also be highly positive.

Which property of colloids is not dependent on the charge on colloidal particles?

1. Coagulation
2. Electrophoresis
3. Electro-osmosis
4. Tyndall effect

In Freundlich adsorption isotherm, the value of 1n is

1. between 0 and 1 in all cases
2. between 2 and 4 in all cases
3. 1 in case of physical adsorption
4. 1 in case of chemisorption.

Which one of the following statements is incorrect about enzyme catalysis?

1. Enzymes are mostly proteinous in nature.
2. Enzyme action is specific.
3. Enzymes are denatured by ultraviolet rays and at high temperature.
4. Enzymes are least reactive at optimum temperature.

The protecting power of lyophilic colloidal sol is expressed in terms of

1. coagulation value
2. gold number
3. critical micelle concentration
4. oxidation number

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

1. x/m = f(p) at constant T
2. x/m = f(T) at constant p
3. p = f(T) at constant (x/m)
4. xm = p T

The Langmuir adsorption isotherm is deduced using the assumption

1. the adsorption sites are equivalent in their ability to adsorb the particles
2. the heat of adsorption varies with coverage
3. the adsorbed molecules interact with each other
4. the adsorption takes place in multilayers