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

1. N₂H₆, ${\mathrm{NH}}_4^{+}$ HCOOH

2. NH₃, ${\mathrm{NH}}_4^{+}$ , HCOOH

3. NH₃, ${\mathrm{NH}}_4^{+}$, HCOO₃

4. N₂H, ${\mathrm{NH}}_4^{+}$, HCOOH

The species described below that contain Lewis acids are:

OH^– , F^– , H⁺ and BCl₃

The ionization constants of formic acid (HCOOH) and hydrocyanic acid (HCN) at 298 K are 1.8 × 10⁻⁴ and 4.8 × 10⁻⁹, respectively. What are the ionization constants of their corresponding conjugate bases, HCOO⁻ and CN⁻, under the same conditions?

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

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:
1. 7.81

Which of the following biological fluids has the minimum concentration of hydrogen ions?

(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.

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 × 10^–2

2. $\mathrm{\alpha }$ = 1.63 × 10^–4

3. $\mathrm{\alpha }$ = 1.63 × 10^–2

4. $\mathrm{\alpha }$ = 0.05 × 10^–2

The salt that gives a neutral solution in water is: