Three reactions involving H2PO4- are given below:

(i) H3PO4 + H2H3O+H2PO4-

(ii) H2PO4- + H2HPO42- + H3O+

(iii) H2PO4- + OHH3PO4 +O2-

In which of the above does H2PO4- act as an acid?

1. (i) only                                 

2. (ii) only

3. (i) and (ii)                           

4. (iii) only

Subtopic:  Acids & Bases - Definitions & Classification |
 61%
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Which of the following is most soluble in water?

1. MnS (Ksp = 8x10-37)         

2. ZnS (Ksp = 7x10-16)

3. Bi2S3 (Ksp = 1x10-70)       

4. Ag2S (Ksp = 6x10-51)

Subtopic:  Solubility Product |
 75%
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The compound that does not act as Lewis acid is:

1. AlCl3                                           

2. BF3

3. NH3                                             

4. FeCl3

Subtopic:  Acids & Bases - Definitions & Classification |
 74%
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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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The solubility product of Hg2I2 is equal to:

1. [Hg22+][I-]

2. [Hg2+][I-]

3. [Hg22+][I-]2

4. [Hg22+]2[I-]2

Subtopic:  Solubility Product |
 59%
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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 |
 59%
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