Multiple Choice QuestionsThe ionisation constant of ammonium hydroxide is 1.77 x 10-5 at 298 K. Hydrolysis constant of ammonium chloride isÂ
5.65 x 10-10
6.50 x 10-12
5.65 x 10-13
5.65 x 10-13
Nitrobenzene can be prepared from benzene by using a mixture of conc. HNO3 and Conc. H2SO4.In the mixture, nitric acid acts as a/an:
reducing agent
acid
base
base
The dissociation constants for acetic acid and HCN at 25o C are 1.5 X 10-5 and 4.5 x 10-10 respectively. The equilibrium constant for the equilibrium,
CN- + CH3COOH Â and HCN + CH3COO-
would be
3 x 105
3.0 x 10-5
3.0 x 10-4
3.0 x 10-4
Equal volumes of three acid solutions of pH 3.4 and 5 are mixed in a vessel. What will be the H+Â ion concentration in the mixture?
1.11 x 10-4 M
3.7 x 10-4 MÂ
3.7 x 10-3 M
3.7 x 10-3 M
If the concentration of OH- ions in the reaction Fe(OH)3 (s)  ⇌ Fe3+ (aq) + 3OH-(aq) is decreased by 1/4 times, then equilibrium concentration of Fe3+ will increase byÂ
8 times
16 times
64 times
64 times
Base strength of 
is in the order ofÂ
(2) > (1) > (3)
(3) > (2) > (1)Â
(1) > (3)> (2)Â
(1) > (3)> (2)Â
Equimolar solutions of the following  were prepared in water separately which one of the solutions will record the highest pH?Â
SrCl2
BaCl2
MgCl2
MgCl2
The dissociation equilibrium  of gas AB2 can be represented as
2AB2 (g) ⇌ 2AB (g) + B2 (g)
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 isÂ
(2Kp / p)
(2Kp/p)1/3
(2Kp/p)1/2
(2Kp/p)1/2
D.
(2Kp/p)1/2
Initial        1          0        0
at equ    2(1-x)        2x        x
where, Â x = degree of dissociation
Total moles at equilibrium = 2-2x + 2x + x
 = ( 2 + x)
The value of KP1 and Kp2 for the reactions
X ⇌ Y +Z  ... (i)
A ⇌ 2B   ... (ii)
are in the ratio of 9:1. if the degree of dissociation of X and A be equal, then the total pressure at equilibrium (i) and (ii) are in the ratio
3:1
1:9
36:1
36:1
The value of equilibrium constant of the reaction HI (g) ⇌ H2(g)/2 + I2/2 is 8.0
The equilibrium constant of the reaction H2(g) + I2(g) ⇌ 2 HI (g)  will be
1/16
1/64
16
16
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