If pKb for fluoride ion at 25°C is 10.83, the ionization constant of hydrofluoric acid at this temperature is

1. 1.74×10-5

2. 3.52×10-3

3. 6.75×10-4

4. 5.38×10-2

Subtopic:  Ionisation Constant of Acid, Base & Salt |
 62%
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The pKa of HCN is 9.30. The pH of a solution prepared by mixing 2.5 moles of KCN and 2.5 moles of HCN in water and making up the total volume to 500 ml will be:

1. 9.30 2. 8.30
3. 7.30 4. 10.30
Subtopic:  Buffer |
 77%
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What is the decreasing order of strength of the bases?

OH-, NH2-, H-CC- and CH3-CH2-?

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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The following equilibrium is established when hydrogen chloride is dissolved in acetic acid

HCl+CH3COOHCl-+CH3COOH2+

The set that characterizes the conjugate acid base pair is

1. (HCl, CH3COOH) and (CH3COOH2+,Cl-)

2. (HCl, CH3COOH2+) and (HCl,CH3COOH2+) and (CH3COOH, Cl-)

3. (CH3COOH2+, HCl) and (Cl-, CH3COOH)

4. (HCl, Cl-) and (CH3COOH2+, CH3COOH)

Subtopic:  Acids & Bases - Definitions & Classification |
 68%
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Which of the following is an example of a reversible reaction?
1. \(\small{KNO_3(aq) + NaCl(aq) \rightleftharpoons KCl(aq) + NaNO_3(aq)}\)
2. \(\small{2Na(s) + H_2O(l) \rightleftharpoons 2NaOH(aq) + H_2(g)}\)
3. \(\small{AgNO_3(aq) + NaCl(aq) \rightleftharpoons AgCl(s) + NaNO_3(aq)}\)
4. \(\small{Pb{(NO_3)}_2(aq) + 2NaI(aq) \rightleftharpoons PbI_2(s) + 2NaNO_3(aq)}\)

Subtopic:  Introduction To Equilibrium |
 59%
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A certain weak acid has a dissociation constant of 1.0×10-4. The equilibrium constant for its reaction with a strong base is

1. 1.0×1010

2. 1.0×1014

3. 1.0×10-10

4. 1.0×10-4

Subtopic:  Ionisation Constant of Acid, Base & Salt |
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The precipitate of CaF2 (Ksp=1.7×10-10) is obtained when equal volumes of the following are mixed

1. 10-2 M Ca2++10-3 MF-

2. 10-3 M Ca2++10-5 MF-

3. 10-4 M Ca2++10-4 MF-

4. 10-5 M Ca2++10-3 MF-

Subtopic:  Solubility Product |
 67%
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In the exothermic reaction of oxidizing SO2 by O2 to SO3, what factors determine the maximum yield of SO3?

 
1. Temperature is reduced and pressure is increased.
2. Temperature is increased and pressure is kept constant.
3. Both temperature and pressure are reduced.
4. Both temperature and pressure are increased.
Subtopic:  Introduction To Equilibrium | Le Chatelier's principle |
 80%
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If a solution of 0.1 M NH4OH and 0.1 M NH4Cl has pH 9.25, then the pKb of NH4OH will be:

1. 9.25 2. 4.75
3. 3.75 4. 8.25
Subtopic:  Buffer |
 66%
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Among the following , the compound with highest pH is : 

1. CH3COOK

2. Na2CO3 

3. NH4Cl

4. NaNO3

Subtopic:  Acids & Bases - Definitions & Classification |
 53%
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