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-

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

 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 ionization constants of  HCOOH, and HCN at 298K are  1.8 × 10^–4 and 4.8 × 10^–9 respectively. The ionization constants of the corresponding conjugate bases of HCOOH and HCN will be:

1. 5.6 x 10^-11, 2.08 x 10^-6

2. 2.4 x 10^-11, 4.2 x 10^-6

3. 3.5 x 10^-11, 1.7 x 10^-6

4. 4.2 x 10^-11, 1.2 x 10^-6

The ionization constant of phenol is 1.0 × 10^–10. The concentration of phenolate ion in 0.05 M solution of phenol will be -

1. 4.2 x 10^-4 M

2. 3.6 x 10^-5 M

3. 7.8 x 10^-6 M

4. 2.2 x 10^-6 M

The first ionization constant of H₂S is 9.1 × 10^–8. The concentration of HS^– ion in its 0.1 M solution will be:

The ionization constant of acetic acid is 1.74 × 10^–5. The pH of acetic acid in its 0.05 M solution will be:

(a) Human muscle-fluid,  pH =6.83 

(b) Human stomach fluid, pH = 1.2

(c) Human blood, pH= 7.38           

(d) Human saliva, pH =6.4.

Out of the above mentioned biological fluids, the one with the minimum concentration of hydrogen ions is:

The pH values of milk, tomato juice, lemon juice, and egg are 6.8, 4.2, 2.2, and 7.8 respectively.

The corresponding hydrogen ion concentration is maximum in: 

The ionization constant of propanoic acid is 1.32 × 10^–5. The degree of ionization of 0.05M acid solution will be:

1. $\mathrm{\alpha }$ = 0.63 x 10^-2

2. $\mathrm{\alpha }$ = 1.63 x 10^-4

3. $\mathrm{\alpha }$ = 1.63 x 10^-2

4. $\mathrm{\alpha }$ = 0.05 x 10^-2