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

The Langmuir adsorption isotherm is deduced using the assumption:
(1) The adsorption takes place in multilayers

(2) The adsorption sites are equivalent in their ability to adsorb the particles

(3) The heat of adsorption varies with  coverage

(4) The adsorbed molecules interact with each other

A plot of log x/m verses log p for the adsorption of a gas on a solid gives a straight line with slope equal to:-

(1) -log k

(2) n

(3) 1/n

(4) log k

The decomposition of phosphine (PH₃) on tungsten at low pressure is a first-order reaction. It is because the:

1. rate is proportional to the surface coverage

2. rate is inversely proportional to the surface coverage

3. rate is independent of the surface coverage

4. rate of decomposition is very slow