The conjugate bases of Bronsted acids H2O and HF are respectively:

1.  H3O+ and H2F+, respectively

2.  OH- and H2F+, respectively

3.  H3O+ and F-, respectively

4.  OH- and F-, respectively

Subtopic:  Acids & Bases - Definitions & Classification |
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pH of a saturated solution of CaOH2 is 9. The solubility product Ksp of CaOH2 is:

1.  0.5×10-10

2.  0.5×10-15

3.  0.25×10-10

4.  0.125×10-15

Subtopic:  pH calculation |
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Which will make basic buffer:

1.  100 mL of 0.1 M HCl+100 mL of 0.1 M NaOH

2.  50 mL of 0.1 M NaOH+25 mL of 0.1 M CH3COOH

3.  100 mL of 0.1 M CH3COOH+100 mL of 0.1 M NaOH

4.  100 mL of 0.1 M HCl+200 mL of 0.1 M NH4OH

Subtopic:  Buffer |
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The hydrogen ion concentration of a 10-8 M HCl aqueous solution at 298 K (Kw = 10-14) is :

1. 1.0×10-6 M

2. 1.0525×10-7 M

3. 9.525×10-8 M

4. 1.0×10-8 M

Subtopic:  pH calculation |
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Which of the following pairs constitutes a buffer?

1. HNO2 and NaNO2

2. NaOH and NaCl

3. HNO3 and NH4NO3

4. HCl and KCl

Subtopic:  Buffer |
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For the reaction, 
CH4(g) + 2O2(gCO2(g) + 2H2O(l
ΔrH = -170.8 kJ mol-1 
Which of the following statements is not true?

1. At equilibrium, the concentration of CO2g and water (l) are not equal.

2. The equilibrium constant for the reaction is given by Kp=[CO2][CH4][O2]

3. Addition of CH4g or O2g at equilibrium will cause a shift to the right

4. The reaction is exothermic

Subtopic:  Kp, Kc & Factors Affecting them |
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Which one of the following orders correctly represents the increasing acid strengths of the given acids?

1. HOCl<HOClO<HOClO2<HOClO3

2. HOClO<HOCl<HOClO3<HOClO2

3. HOClO2<HOClO3<HOClO<HOCl

4. HOClO3<HOClO2<HOClO<HOCl

Subtopic:  Acids & Bases - Definitions & Classification |
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Which ionic species has the greatest proton affinity to form stable compounds?

1. HS-

2. NH2-

3. F-

4. l-

Subtopic:  Acids & Bases - Definitions & Classification |
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The following equilibrium constants are given : 
N2 + 3H22NH3K1 
N2 + O22NO; K2 
H2 + 1/2O2H2O; K3 
The equilibrium constant for the oxidation of NH3 by oxygen to give NO is:

1. K2K33/K1

2. K2K32/K1

3. K22K3/K1

4. K1K2/K3 

Subtopic:  Kp, Kc & Factors Affecting them |
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A weak acid, HA, has a Ka of 1.00×10-5. If 0.100 mole of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to :

1. 99.0%

2. 1%

3. 99.9%

4. 0.100%

Subtopic:  Salt Hydrolysis & Titration |
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