The compound that does not act as Lewis acid is:

1. AlCl3                                           

2. BF3

3. NH3                                             

4. FeCl3

Subtopic:  Acids & Bases - Definitions & Classification |
 75%
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For which salt the pH of its solution does not change with dilution?

1. NH4Cl                           

2. CH3COONH4

3. CH3COONa                   

4. None of these

Subtopic:  Kp, Kc & Factors Affecting them |
 51%
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For a sparingly soluble salt ApBq, the relationship of its solubility product (Ls) with its solubility (s) is:

1. Ls =sp+q.pp.q                          

2.  Ls =sp+q.pq.qp  

3. Ls =spq.pp.q                           

4.  Ls = spq.(pq)p+q

Subtopic:  Solubility Product |
 68%
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For the reaction, N2 + 3H2 2NH3 in a vessel, after the addition of an equal number of mole of N2 and H2, the equilibrium state is formed. Which of the following is correct?

1. [H2] = [N2]                               

2. [H2] < [N2]     

3. [H2] > [N2]                                 

4. [H2] > [NH3]      

Subtopic:  Introduction To Equilibrium |
 52%
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The conjugate base of [Al(H2O)3(OH)3] is:

1. [Al(H2O)3(OH)2]+                           

2. [Al(H2O)3(OH)2O]-

3. [Al(H2O)3(OH)3]-                           

4.  [Al(H2O)2(OH)4]-

Subtopic:  Acids & Bases - Definitions & Classification |
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For NH4HS(s) NH3 (g) + H2S(g), the observed pressure for reaction mixture in equilibrium is 1.12 atm at 106°C. The value of Kp for the reaction is:

1. 3.136 atm                          

2. 0.3136 atm2

3. 31.36 atm2                           

4. 6.98 atm2

Subtopic:  Kp, Kc & Factors Affecting them |
 70%
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Which oxide of nitrogen is the most stable?

1. 2NO2(g) N2(g) + 2O2(g);         K=6.7x1016 mol litre-1

2. 2NO(g) N2(g) + O2(g);            K=2.2x1030 mol litre-1

3. 2N2O5(g) 2N2(g) + 5O2(g);      K=1.2x1034 mol-5 litre-5

4. 2N2O(g) 2N2(g) + O2(g);         K=3.5x1033 mol litre-1

Subtopic:  Le Chatelier's principle |
 58%
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On adding A to the reaction at equilibrium,  AB(s)  A(g) + B(g), the new equilibrium concentration of A becomes double, the equilibrium concentration of B would become:

1. 1/2 of its original value

2. 1/4 of it s original value

3. 1/8 of its original value

4. twice of its original value

Subtopic:  Introduction To Equilibrium |
 75%
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2 mole of PCl5 were heated in a closed vessel of 2 litre capacity. At equilibrium 40% of PCl5 dissociated into PCl3 and Cl2. The value of the equilibrium constant is :

1. 0.267

2. 0.53

3. 2.63

4. 5.3

Subtopic:  Kp, Kc & Factors Affecting them |
 61%
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Given, HF + H2OKaH3O+ + F-

          F- + H2KbHF + OH-

which relation is correct?

1. Kb =Kw                       

2. Kb =1/Kw 

3. Ka x Kb =Kw                 

4.  Ka/Kb = Kw 

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 79%
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