Among the following examples, the species that behave(s) as a Lewis acid is/are: 
BF3,SnCl2,SnCl4 
1. Stannous chloride, stannic chloride
2. BF3stannous chloride
3. Only BF3
4. BF3, stannous chloride , stannic chloride

Subtopic:  Acids & Bases - Definitions & Classification |
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Conjugate acid of NH2 is:

1. NH4OH

2. NH4+

3. \(NH_{2}^{-}\)

4. NH3

Subtopic:  Acids & Bases - Definitions & Classification |
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A compound among the following that cannot be classified as a protonic acid is:

1. B(OH)3 2. PO(OH)3
3. SO(OH)2 4. SO2(OH)2
Subtopic:  Acids & Bases - Definitions & Classification |
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