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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Which of the following cannot act both as a Bronsted acid and as a Bronsted base?

1. HCO3-

2. NH3

3. HCl

4. HSO4-

Subtopic:  Acids & Bases - Definitions & Classification |
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Boric acid is an acid because its molecule
1.  contains replaceable H+ ion
2.  gives up a proton
3.  accepts OH- from water releasing proton into the solution
4.  combines with proton from water molecules

Subtopic:  Acids & Bases - Definitions & Classification |
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Which of the following fluoro-compounds is most likely to behave as a Lewis base?
1.  BF3
2.  PF3
3.  CF4
4.  SiF4

Subtopic:  Acids & Bases - Definitions & Classification |
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Among the following the correct order of acidity is

1. HClO < HClO2< HClO3< HClO4
2. HClO2< HClO < HClO3< HClO4
3. HClO4< HClO2< HClO < HClO3
4. HClO3< HClO4< HClO2< HClO

Subtopic:  Acids & Bases - Definitions & Classification |
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Which of these is least likely to act as Lewis base?
1. F
2. BF3
3. PF3
4. CO

Subtopic:  Acids & Bases - Definitions & Classification |
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Which of  the following molecular hydrides acts as a Lewis acid ?

1. NH3

2. H2O

3. B2H6

4. CH4

Subtopic:  Acids & Bases - Definitions & Classification |
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The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence

1. BCl3>BF3>BBr3

2. BBr3>BCl3>BF3

3. BBr3>BF3>BCl3

4. BF3>BCl3>BBr3

Subtopic:  Acids & Bases - Definitions & Classification |
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Which of the following molecules acts as a Lewis acid?
1. (CH3)3B
2. (CH3)2O
3. (CH3)3P
4. (CH3)3N
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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