The values of dissociation constant of bases are given below. Whi

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 Multiple Choice QuestionsMultiple Choice Questions

171.

For the reaction,

H2 (g) + I2 (g)  2HI (g),

the equilibrium constants expressed in terms of concentrations Kc and in terms of partial pressures Kp, are related as:

  • Kp = Kc (RT)2

  • Kp = Kc(RT)-2

  • Kp = Kc

  • Kc = Kp(RT)


172.

Which of the following pairs are correctly matched?
1. Haber process Manufacture of ammonia
2. Leblanc process Manufacture of sulphuric acid
3. Birkeland-Eyde process Manufacture of nitric acid
4. Solvay process Manufacture of sodium carbonate

Select the correct answer using the codes given below-

  • 1, 3 and 4

  • 2, 3 and 4

  • 1, 2, 3 and 4

  • 1, 2 and 4


173.

Which of the following will favour the reverse reaction in a chemical equilibrium ?

  • Increasing the concentration of the reactants

  • Removal of at least one of the products at regular intervals

  • Increasing the concentration of one or more of the products

  • Increasing the pressure


174.

Kp and Kc are related as :

  • Kp = Kc(RT)Δn

  • Kp + K= (RT)Δn

  • Kc= Kp

  • Kp .Kc= (RT)Δn


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175.

100 mL of 0.01 M solution of NaOH is diluted to 1 dm3. What is the pH of the diluted solution?

  • 12

  • 11

  • 2

  • 3


176.

Relation between hydrolysis constant and dissociation constant are given. Which is the correct formula for MgCl2 ?

  • KhKwKa

  • KhKwKb

  • KhKwKa × Kb

  • KwKhKb


177.

Calculate pOH of 0.001 M NH4OH when it is 1% dissociated in the solution.

  • 5

  • 2.96

  • 9.04

  • 11.04


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178.

The values of dissociation constant of bases are given below. Which is the weakest base?

  • 1.8 × 10-5

  • 4.8 × 10-10

  • 7.2 × 10-11

  • 7.07 × 10-7


C.

7.2 × 10-11

For base BOH,

BOH  B+ + OH-

Dissociation constant, KbB+OH-BOH

Higher the value of Kb, more will be dissociation of base and stronger will be base and vice-versa.

Therefore, among the given choices, 7.2 × 10-11 is the weakest base.


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179.

The pH of millimolar HCl is

  • 1

  • 3

  • 2

  • 4


180.

0.5 M ammonium benzoate is hydrolysed to 0.25 percent, hence, its hydrolysis constant is

  • 2.5 x 10-5

  • 1.5 x 10-4

  • 3.125 x 10-6

  • 6.25 x 10-6


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