Measuring Zeta potential is useful in determining which of the following property of a colloidal solution:

1. Solubility.

2. Stability of the colloidal particles.

3. Size of the colloidal particles.

4. Viscosity.

Who coined the term catalysis and was awarded Nobel Prize?

(1) Berzelius

(2) Kolbe

(3) Wholer

(4) Rutherford

Catalytic poisoners act by:

1. coagulating the catalyst

2. getting adsorbed on the active centres on the surface of catalyst

3. chemical combination with any one of the reactants 

4. None of the above

Which characteristic is not correct for physical adsorption?

1. Adsorption is spontaneous

2. Both enthalpy and entropy change of adsorption are negative

3. Adsorption on solid is reversible

4. Adsorption increases with an increase in temperature

A catalyst increases the rate of reaction because it:

1. Increases the activation energy

2. Decreases the energy barrier for the reaction

3. Decreases the collision diameter

4. Increases the temperature coefficient

In Langmuir's model of adsorption of a gas on a solid surface:

(1) the rate of dissociation of adsorbed molecules from the surface does not depend on the surface covered

(2) the adsorption at a single site on the surface may involve multiple molecules at the same time

(3) the mass of gas striking a given area of surface is proportional to the pressure of the gas

(4) the mass of gas striking a given area of surface is independent of the pressure of the gas

Rate of physisorption increases with:

(1) Decrease in temperature

(2) Increase in temperature

(3) Decrease in pressure

(4) Decrease in surface area

Adsorption of a gas on solid metal surface is spontaneous and exothermic, then:

(1) H increases

(2) S increases

(3) G increases

(4) S decreases

Identify the correct statement regarding enzymes:

(1) Enzymes are specific biological catalyst that possess well defined active states

(2) Enzymes are normally heterogeneous catalyst that are very specific in their action

(3) Enzymes are specific biological catalysts that can not be poisoned

(4) Enzymes are specific biological catalysts that can normally function at very high temperature (T$\simeq$1000K)

Which of the following statements is incorrect regarding physisorptions?

(1) More easily liquefiable gases are adsorbed readily

(2) Under high pressure it results into multimolecular layer on the adsorbent surface

(3) Enthalpy of adsorption ($∆H_{adsorption}$) is low and positive

(4) It occurs because of van der Waal's forces