CBSE
If the equilibrium constant for
K1/2
K/2
K
K
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
What is [H+] in mol/L of a solution that is 0.20 M in CH3COONa and 0.10 M in CH3COOH?
(Ka for CH3COOH = 1.8 x 10-5 )
3.5 x 10-4
1.1 x 10-5
1.8 x 10-5
1.8 x 10-5
Which of the following molecules acts as a Lewis acid?
(CH)3B
(CH3)O
(CH3)P
(CH3)P
The ionisation constant of ammonium hydroxide is 1.77 x 10-5 at 298 K. Hydrolysis constant of ammonium chloride is
5.65 x 10-10
6.50 x 10-12
5.65 x 10-13
5.65 x 10-13
In a buffer solution containing an equal concentration of B- and HB, the Kb for B- is 10-10.The pH of buffer solution is
10
7
6
6
An aqueous solution of which of the following compounds is the best conductor of electric current?
Acetic acid C2H4O2
Hydrochloric acid, HCl
Ammonia, NH3
Ammonia, NH3
The reaction,
2A (g) + B (g) ⇌ 3C (g) + D (g)
is begun with the concentrations of A and B both at an initial value of 1.00 M. When equilibrium is reached, the concentration of D is measured and found to be 0.25 M. The value for the equilibrium constant for this reaction is given by the expression
[(0.75)3 (0.25)] / [(1.00)2 (1.00)]
[(0.75)3 (0.25) ] / [(0.50)2(0.75)]
[(0.75)3(0.25)] / [(0.50)2(0.75)]
[(0.75)3(0.25)] / [(0.50)2(0.75)]
In which of the following equilibrium Kc and Kp are not equal?
2NO (g) ⇌ N2 (g) + O2 (g)
SO2 (g) + NO2 (g) ⇌ SO3 (g) + NO (g)
H2 (g) + I2 (g) ⇌ 2 HI (g)
H2 (g) + I2 (g) ⇌ 2 HI (g)
If pH ofa saturated solution of Ba(OH)2 is 12, the value of its Ksp is
4.00 x 10-6 M3
4.00 x 10-7 M3
5.00 x 10-6 M3
5.00 x 10-6 M3