The pKa of acetylsalicylic acid (aspirin) is 3.5. The pH of gastric juice in the human stomach is about 2-3 and the pH in the small intestine is about 8. Aspirin will be:

1. Unionized in the small intestine and in the stomach

2. Completely ionized in the small intestine and in the stomach

3. Ionized in the stomach and almost unionized in the small intestine

4. Ionized in the small intestine and almost unionized in the stomach

Subtopic:  Kp, Kc & Factors Affecting them |
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What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH?

(Ka for CH3COOH = 1.8 x 10-5)       

1. 3.5x10-4           

2. 1.1x10-5

3. 1.8x10-5           

4. 9.0x10-6

Subtopic:  Buffer |
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The hydrolysis of the salt of strong acid and a weak base is called:

1. anionic hydrolysis

2. cationic hydrolysis

3. amphoteric hydrolysis

4. none of the above

Subtopic:  Salt Hydrolysis & Titration |
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For the reaction, A+B3C at 25° C, a 3 litre vessel contains 1,2, 4 mole of A, B and C respectively. If Kc for the reaction is 10, the reaction will proceed in:

1. forward direction                           

2. backward direction

3. in either direction                           

4. in equilibrium

Subtopic:  Introduction To Equilibrium |
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The pH of 0.1M soution of the folowing salts increases in the order:

1. NaCl < NH4Cl < NaCN < HCl

2. HCl < NH4Cl < NaCl < NaCN

3. NaCN < NH4Cl < NaCl < HCl

4. HCl < NaCl < NaCN < NH4Cl 

Subtopic:  pH calculation |
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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 |
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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 |
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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 |
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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 |
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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 |
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