The conjugate base of H3BO3 is:

1. B(OH)4-                                     

2. H2BO3-

3. HBO32-                                       

4. H4BO3+

Subtopic:  Acids & Bases - Definitions & Classification |
 63%
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The degree of dissociation of PCl5 (α) obeying the equilibrium,

PCl5 (g PCl3 (g) + Cl2 (g), is approximately related to the pressure at equilibrium by:

1. αP                                         

2.  α1/P

3.  α1/P2                                   

4.  α1/P4

Subtopic:  Introduction To Equilibrium |
 59%
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In a system: A(s)      2B(g) + 3C(g). If the concentration of C at eqilibrium is increased by a factor 2, it will cause the eqilibrium concentration of B to change to:

1. two times of its original value

2. one half of its original value

3. 22 times of its original value

4. 122 times of its original value

Subtopic:  Kp, Kc & Factors Affecting them |
 51%
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For the reaction:

 CO(g) + 12O2(g) CO2(g), Kp/Kis:

1. RT              

2. (RT)-1               

3. (RT)-1/2               

4. (RT)1/2

Subtopic:  Kp, Kc & Factors Affecting them |
 82%
From NCERT
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 A weak acid, HA has a Ka of 1.00 x 10-5. If 0.100 mole of this acid is dissolved in one litre of water, the percentage of acid dissociated at equibrium is closest to

1. 99.9%                           

2. 1.00%                      

3. 99.9%                             

4. 0.100%

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 61%
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If little heat is added to ice  liquid equilibrium in a sealed container, then:

1. Pressure will rise                           

2. Temperature will rise

3. Temperature will fall                       

4. No change in P and T

Subtopic:  Kp, Kc & Factors Affecting them |
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In the equilibrium,

2SO2(g) + O2 (g) 2SO3(g), the partial pressure of SO2, O2 and SO3 are 0.662, 0.101 and 0.331 atm respectively. What should be the partial pressure of oxygen so that the equilibrium concentration of SO2 and SO3 are equal.

1. 0.4 atm                   

2. 1.0 atm

3. 0.8 atm                   

4. 0.25 atm

Subtopic:  Kp, Kc & Factors Affecting them |
From NCERT
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Ionisation constant of CH3COOH is 1.7 X 10-5 and concentration of H+ ions is 3.4 X 10-4.Then, find out initial concentration of CH3COOH molecules.            

1. 3.4 X 10-4 

2. 3.4 X 10-3

3. 6.8 X 10-4

4. 6.8 X 10-3

 

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 56%
From NCERT
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The formation of phosgene is represented as,

            CO + Cl2 COCl2

The reaction is carried out in 500 mL flask. At equilibrium o.3 mole of phosgene, 0.1 mole of CO and 0.1 mole of Cl2 are present. The equilibrium constant of the reaction is:

1. 30                     

2. 15

3. 5                       

4. 3

Subtopic:  Introduction To Equilibrium |
 65%
From NCERT
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The decreasing order of strength of the bases,

OH-, NH2-, H-CC- and CH3-CH2- is:

1. CH3-CH2->NH2-> H-CC->OH-

2. H-CC-> CH3-CH2->NH2->OH-

3. OH->NH2->H-CC->CH3-CH2-

4. NH2->H-CC->OH->CH3-CH2-

 

Subtopic:  Acids & Bases - Definitions & Classification |
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