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

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

(c) Enzymes catalyse mainly biochemical reaction

(d) Coenzymes increase the catalytic activity of enzyme

Subtopic:  Catalyst |
 84%
NEET - 2017
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The coagulation values in millimoles per litre 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

Subtopic:  Colloidal Solution |
 83%
From NCERT
NEET - 2016
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The addition of a catalyst during a chemical reaction alters which of the following quantities?

(a) Internal energy
(b) Enthalpy
(c) Activation energy
(d) Entropy

Subtopic:  Catalyst |
 94%
NEET - 2016
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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

Subtopic:  Adsorption and Absorption |
 86%
From NCERT
NEET - 2016
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Which one of the following statements is incorrect about enzyme catalysis?

(a) Enzymes are mostly proteinous in nature

(b) Enzyme action is specific

(c) Enzymes are denaturated by ultraviolet rays and at high temperature

(d) Enzymes are least reactive at optimum temperature

Subtopic:  Catalyst |
 92%
NEET - 2012
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The protecting power of lyophilic colloidal sol is expressed in terms of 

(a) coagulation value

(b) gold number

(c) critical micelle concentration

(d) oxidation number

Subtopic:  Lyophilic & Lyophobic Sol |
 89%
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The stabilization of the dispersed phase in a lyophobic sol is due to

(1) The viscosity of the medium

(2) The surface tension of the medium

(3) Liking for the medium

(4) The formation of an electrical layer between the two phases

Subtopic:  Lyophilic & Lyophobic Sol |
 82%
From NCERT
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The process of converting precipitate into collidal solution on adding an electrolyte is called:

(A) Peptisation                             

(B) Dialysis

(C) Electro-osmosis                     

(D) Eelectrophoresis

Subtopic:  Colloidal Solution |
 87%
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Emulsifying agent stabilized the emulsion of oil in water by

1.  Forming an interfacial film between suspended particles and the medium

2.  Dissolving the suspended particles into the medium completely

3.  Coagulating the suspended particles from medium completely

4.  Converting the suspended particles into vapor completely

 

Subtopic:  Emulsions |
 68%
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If 227g of charcoal having, active surface area 1000 m2/g is used for monolayer absorption of a gas having molecular radius 10-8 cm, then volume of the absorbed gas at STP is [Avogadro's number = 6 × 1023]

1.  11.2 L

2.  22.4 L

3.  7.46 L

4.  3.73 L

Subtopic:  Adsorption and Absorption |
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