The ionisation 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
For a given solution pH = 6.9 at 60C, where Kw=10-12. The solution is:
1. acidic
2. basic
3. neutral
4. unpredictable
In a buffer solution containing equal concentration of B- and H B, the Kb for B- is 10-10. The pH of buffer solution is
1. 10
2. 7
3. 6
4. 4
The equilibrium, 2SO2 (g) + O2 (g) 2SO3 (g)
shifts forward if:
1. a catalyst is used
2. an absorbent is used to remove SO3 as soon as it is formed
3. small amounts of reactants are used
4. none of the above
The pH of blood is maintained by CO2 by and H2CO3 in the body and chemical constituents of blood. This phenomenon is called:
1. colloidal
2. buffer action
3. acidic
4. salt balance
At temperature T, a compound AB2 (g) dissociates according to the reaction 2AB22AB(g) +B2(g) with a degree of dissociation x, which is small compared with unity. The expression for Kp, in terms of x and the total pressure P , is:
1. Px3/2
2. Px2/3
3. Px3/3
4. Px2/2
For the reactions,
A B; Kc = 2
B C; Kc = 4
C D; Kc = 6
Kc for the reaction, A D is:
1. (2+4+6)
2. (2x4)/6
3. (4x6)/2
4. 2x4x6
For the reaction equilibrium,
2NOBr(g) 2NO(g) + Br2(g), if = P/9 at equilibrium and P is total pressure. The ratio of Kp/P is equal to:
1. 1/9
2. 1/81
3. 1/27
4. 1/3
Which of the following salts will give the highest pH in the water?
1. KCl
2. NaCl
3. Na2CO3
4. CuSO4
An aqueous solution of which salt has the lowest pH?
1. NaOH
2. NH4Cl
3. Na2CO3
4. NaCl