In a buffer solution containing an equal concentration of B- and HB, the Kb for B- is 10-10. pH of the buffer solution is:
1. | 10 | 2. | 7 |
3. | 6 | 4. | 4 |
Which of the following molecular hydrides acts as a Lewis acid?
1.
2.
3.
4.
The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence:
1.
2.
3.
4.
The ionization constant of ammonium hydroxide is 1.77 x 10-5 at 298 K. Hydrolysis constant of ammonium Chloride is:
1. 5.65 x 10-10
2. 6.50 x 10-12
3. 5.65 x 10-13
4. 5.65 x 10-12
What is the [OH-] in the final solution prepared by mixing 20.0 mL of 0.050 M HCl with 30.0 mL of 0.10 M Ba(OH)2?
1. 0.10 M
2. 0.40 M
3. 0.0050 M
4. 0.12 M
The dissociation constants for acetic acid and HCN at 25 °C are 1.5 x 10-5 and 4.5 x 10-10, respectively. The equilibrium constant for the equilibrium,
CN- + CH3COOH ⇌ HCN + CH3COO-
would be:
1.
2.
3.
4.
Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H+ ion concentration in the mixture?
1.
2.
3.
4.
The dissociation equilibrium of a gas AB2 can be represented as
The degree of dissociation is ‘x’ and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant KP and total pressure p is:
1. (2KP/p)
2. (2Kp /p)1/3
3. (2KP/p)1/2
4. (KP/P)
The value of KP1 and Kp2 for the reactions
are in the ratio of 9 : 1. If the degree of dissociation of X and A is equal, then the total pressure at equilibrium(i) and (ii) are in the ratio:
1. 3 : 1
2. 1 : 9
3. 36 : 1
4. 1 : 1