The ionisation constant of ammonium hydroxide is 1.77 x 10-5 at

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 Multiple Choice QuestionsMultiple Choice Questions

461.

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)

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462.

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

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463.

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)]

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464.

Which of the following molecules acts as a Lewis acid?

  • (CH)3B

  • (CH3)O

  • (CH3)P

  • (CH3)P

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465.

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


A.

5.65 x 10-10

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466.

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

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467.

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  and HCN + CH3COO-

would be

  • 3 x 105

  • 3.0 x 10-5

  • 3.0 x 10-4

  • 3.0 x 10-4

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468.

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?

  • 1.11 x 10-4 M

  • 3.7 x 10-4

  • 3.7 x 10-3 M

  • 3.7 x 10-3 M

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469.

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 by 

  • 8 times

  • 16 times

  • 64 times

  • 64 times

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470.

Base strength of 

1. space straight H subscript 3 straight C straight C with minus on top straight H subscript 2
2. space straight H subscript 2 straight C equals straight C with minus on top straight H
3. space straight H minus space straight C identical to straight C with minus on top

is in the order of 

  • (2) > (1) > (3)

  • (3) > (2) > (1) 

  • (1) > (3)> (2) 

  • (1) > (3)> (2) 

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