Buffer solution among the following options is :           

1. HNO2 and NaNO2           

2. NaOH and NaCl

3. HNO3 and NH4NO3         

4. HCl and KCl

Subtopic:  Buffer |
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According to Le-Chatelier's principle, adding heat to a solid ⇌ liquid equilibrium will cause the 

1. Temperature to increase

2. Temperature to decrease

3. Amount of liquid to decrease

4. Amount of solid to decrease

Subtopic:  Le Chatelier's principle |
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Ostwald's solution dilution law is applicable in the case of the solution of:

1. CH3COOH                                     

2. NaCl

3. NaOH                                           

4. H2SO4

Subtopic:  Introduction To Equilibrium |
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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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