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

A catalyst:

(1) Increases the average kinetic energy of the reacting molecules

(2) Increases the activation energy

(3) Alters the reaction path mechanism

(4) Increases the frequency of collisions of the reacting species

A catalyst is a substance that:

(1) Increases the equilibrium constant of the reaction

(2) Changes the equilibrium conc. of reaction

(3) Shortens the time to reach equilibrium

(4) Supplies the energy of the reaction

The separation of colloidal particles (or purification of sol) from particles of molecular dimensions is known as:

1. Photolysis

2. Dialysis

3. Pyrolysis

4. Peptization

Lyophilic sols are:

(1) Irreversible sols

(2) They are prepared from inorganic compounds

(3) Not coagulated by adding electrolytes

(4) Self-stabilizing

The volume of colloidal particles $V_c$ as compared to the volume of solute particles in true solution $V_s$ could be:

(1) $~$1

(2) $~{10}^3$

(3) $~{10}^2$

(4) $~{10}^{-3}$

The dispersed phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged respectively, which of the following statement is not correct?

(1) MgCl₂ solution coagulates gold sol readily than iron (III) hydroxide sol  at pH = 7

(2) Na₂SO₄ solution causes coagulation in both sol

(3) Mixing of two sols have no effect

(4) Coagulation in both sol can be brought about by electrophoresis

Pick out the wrong statement.

1. Micelles are formed by surfactant molecules above the Critical Micelle Concentration (CMC)

2. The conductivity of a solution having surfactant molecules decreases sharply at the CMC

3. Lower is the CMC of detergent, more is its detergency

4. Cleansing action is not related to micelles