Important Questions of Equilibrium Chemistry | Zigya

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301.

Select the pKa value of the strongest acid from the following

  • 1.0

  • 3.0

  • 2.0

  • 4.5


302.

The compounds A and B are mixed in equimolar proportion to form the products, A +B  C+ D. At equilibrium, one third of A and B are consumed. The equilibrium constant for the reaction is

  • 0.5

  • 4.0

  • 2.5

  • 0.25


303.

If, in the reaction N2O4  2NO2 ,x is that part of N2O4 which dissociates, then the number of molecules at equilibrium will be

  • 1

  • 3

  • (1 + x)

  • (1 + x)2


304.

Which of the following is an amphoteric acid?

  • Glycine

  • Salicylic acid

  • Benzoic acid

  • Citric acid


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305.

For the reaction

N2 (g) + O2 (g)  2NO (g), the value of Kc at 800°C is 0.1. When the equilibrium concentration of both the reactants is 0.5 mol, what is the value of Kp at the same temperature?

  • 0.5

  • 0.1

  • 0.01

  • 0.025


306.

The species among the following, which can act as an acid and a base is

  • HSO4-

  • SO42-

  • H3O+

  • Cl-


307.

A buffer solution has equal volumes of 0.2 M NH4OH and 0.02 M NH4Cl. The pKb of the base is 5. The pH is

  • 10

  • 9

  • 4

  • 7


308.

A precipitate of AgCl is formed when equal volumes of the following are mixed [Ksp for AgCl = 10-10]

  • 10-4 M AgNO3 and 10-7 M HCl

  • 10-5 M AgNO3 and 10-6 M HCl

  • 10-5 M AgNO3 and 10-4 M HCl

  • 10-6 M AgNO3 and 10-6 M HCl


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309.

4 moles each of SO2 and Ogases are allowed to react to form SO3, in a closed vessel. At equilibrium 25% of O2 is used up. The total number of moles of all the gases at equilibrium is :

  • 6.5

  • 7.0

  • 8.0

  • 2.0


310.

Solubility product of a salt AB is 1 x 10-8 M2 in a solution in which the concentration of A+ ions is 10M.The salt will precipitate when the concentration of B ions is kept :

  • between 10-8 M to 10-7 M

  • between 10-7 M to 10-8 M

  • >10-5 M

  • <10-8 M


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