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 denaturated 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

Fog is a colloidal solution of:-

1. Gas in liquid

2. Solid in gas

3. Gas in gas

4. Liquid in gas

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

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

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

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

Which of the following process is used in the extractive metallurgy of magnesium?

1. Fused salt electrolysis

2. Self reduction

3. Aqueous solution electrolysis

4. Thermite process.

On adding ${\mathrm{AgNO}}_3$ solution into KI solution, a negatively charged colloidal sol. is obtained When they are in

1.  100 ml of 0.1 ${\mathrm{MAgNO}}_3$ + 100 ml of 0.1 MKl

2.  100 ml of 0.1 ${\mathrm{MAgNO}}_3$ + 50 ml of 0.2 MKl

3.  100 ml of 0.2 ${\mathrm{MAgNO}}_3$ + 100 ml of 0.1 MKl

4.  100 ml of 0.1 ${\mathrm{MAgNO}}_3$ + 100 ml of 0.15 MKl

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

1. AlCl₃

2. BaCl₂

3. NaCl

4. KCl