The conjugate bases for Brönsted acids, H2SO4, and HCO3- will be, respectively:
1. ,
2. HSO4-, CO3-
3. SO4-2, CO32-
4. HS2O4-, CO32-
The conjugate acids for the Brönsted bases , NH3 and HCOO– will be respectively:
1. N2H6, NH4+, HCOOH
2. NH3, , 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:
1. | 12.3 x 10-7 M | 2. | 11.4 x 10-6 M |
3. | 3.5 x 10-4 M | 4. | 9.54 x 10-5 M |
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
|
2. | 3.03
|
3. | 8.54
|
4. | 1.45 |
(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:
1. | Human blood | 2. | Human muscle fluid |
3. | Human stomach fluid | 4. | Human saliva |
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:
1. | Lemon juice
|
2. | Milk
|
3. | Egg white
|
4. | Tomato juice |
The ionization constant of propanoic acid is 1.32 × 10–5. The degree of ionization of 0.05M acid solution will be:
1. = 0.63 x 10-2
2. = 1.63 x 10-4
3. = 1.63 x 10-2
4. = 0.05 x 10-2