Match the following species with the corresponding conjugate acid.

Codes

The conjugate acids for the Brönsted bases  ${\mathrm{NH}}_2^{-}$ , NH₃ and HCOO^– will be respectively:

1. N₂H₆, NH⁴⁺, HCOOH

2. NH₃, ${\mathrm{NH}}_4^{+}$ , HCOOH

3. NH₃, NH⁴⁺, HCOO₃

4. N₂H, NH⁴⁺, HCOOH

The conjugate acid-base pair is 

1. A pair that differs only by one proton

2. A pair that differs only by the size

3. A pair that differs only by electronegativity

4. None of the above

The conjugate bases for Brönsted acids, H₂SO₄, and HCO₃^- will be, respectively:

1. ${\mathrm{HSO}}_4^{-}$, ${\mathrm{CO}}_3^{2-}$

2.  HSO₄^-, CO₃^-

3. SO₄^-2, CO₃^2-

4. HS₂O₄^-, CO₃^2-

Given below are two statements: 

The molecule that cannot function as both Bronsted acid and base: 

1. ${\mathrm{HCO}}_3^{-}$

2. ${\mathrm{NH}}_3$

3. HCl

4. ${\mathrm{HSO}}_4^{-}$

 OH^– , F^– , H⁺ and BCl₃ 

The species described above that contain Lewis acids are:

1. BCl₃ and F^-

2. OH^– and F^-

3. H⁺and BCl₃

4. F^- and BCl₃

The species that can act as Bronsted acids as well as bases is/are:

1.  ${\mathrm{H}}_2\mathrm{O}$

2.  ${\mathrm{HCO}}_3^{-},$ ${\mathrm{HSO}}_4^{-}$ $$

3.  ${\mathrm{NH}}_3$

4.  All of the above.

Acidity of BF₃ can be explained on the basis of: 

1. Arrhenius concept

2. Bronsted Lowry concept 

3. Lewis concept

4. Bronsted Lowry as well as Lewis concept

Litmus is not affected by hydracids when they are

1. In contact with water

2. Dry

3. Fused with each other                 

4. Mixed together and dissolved in water