Colloidal solution of gold prepared by different methods of different colours because of:

1. different diameters of colloidal gold particles

2. variable valency of gold

3. different concentration of gold particles

4. impurities produced by different methods

Which one of the following statements is not correct?
(1) Catalyst does not initiate any reaction

(2) The value of equilibrium constant is changed in the presence of a catalyst in the reaction equilibrium

(3) Enzymes catalyse mainly biochemical reaction

(4) Coenzymes increase the catalytic activity of enzyme

The coagulation values in millimoles per liter 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

The addition of a catalyst during a chemical reaction alters which of the following quantities?

(1) Internal energy

(2) Enthalpy

(3) Activation energy

(4) Entropy

Which one of the following characteristics is associated with adsorption?

(1) $∆$G, $∆$H and $∆$S all are negative

(2) $∆$G and $∆$H are negative but $∆$S is positive

(3) $∆$G and $∆$S are negative but $∆$H is positive

(4) $∆$G is negative but $∆$H and $∆$S are positive

Fog is a colloidal solution of:-

1. Gas in liquid

2. Solid in gas

3. Gas in gas

4. Liquid in gas

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

1. Coagulation           

2. Electrophoresis

3. Electroosmosis       

4. Tyndall effect

According to Freundlich adsorption isotherm, which of the following is correct:-

(1) $\frac{\mathrm{x}}{\mathrm{m}}\mathrm{\alpha } \mathrm{p}°$

(2) $\frac{\mathrm{x}}{\mathrm{m}}\mathrm{\alpha } \mathrm{p}$

(3) $\frac{\mathrm{x}}{\mathrm{m}}\mathrm{\alpha } {\mathrm{p}}^{1/\mathrm{n}}$

(4) All are correct for different ranges of pressure

The most suitable electrolyte for the coagulation of arsenic sulphide will be:-

1. AlCl₃

2. BaCl₂

3. NaCl

4. KCl

In the langmuir adsorption isotherm, the postulates were:-

(A) Adsorption of a gas molecule at a particular site depends on neighboring sites.

(B) Gases undergoes adsorption behave ideally

     (1) Only A is correct

     (2) Only B is correct

     (3) Both are correct

     (4) None of these