Which of the following pairs will show common ion effect? from C

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 Multiple Choice QuestionsMultiple Choice Questions

391.

At a certain temperature, the solubility of the salt, MmAn in water is s mol/L. The solubility product of the salt is

  • MmAn

  • (m + n)sm + n

  • mmnnsm + n

  • mmAns


392.

The conjugated base of hydrazoic acid is

  • HN3-

  • N2-

  • N3-

  • N3-


393.

The pKa value of (I) 2 - bromo propanoic acid, (II) 2-fluoro propanoic acid, (III) 3 - fluoro propanoic acid, (IV) 3- bromo propanoic acid decreases as

  • I > III > IV > II

  • II > IV > III > I

  • I > IV > III > II

  • IV > I > III > II


394.

Which is the strongest Lewis base ?

  • SbH3

  • AsH3

  • PH3

  • NH3


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395.

Which of the following pairs will show common ion effect?

  • Barium chloride + Barium sulphate

  • Silver cyanide + Potassium nitrite

  • Ammonium hydroxide + Ammonium chloride

  • Sodium chloride + Hydrogen chloride


C.

Ammonium hydroxide + Ammonium chloride

Common ion effect is the suppression of degree of dissociation of weak electrolyte on adding a strong electrolyte having an ion common. Since, ammonium hydroxide is a weak electrolyte and ammonium chloride is a strong electrolyte having common ammonium ion, thus NH4Cl decreases the degree of dissociation of NH4OH. Hence, NH4Cl + NH4OH exhibits common ion effect.


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396.

Which of the following is the most basic ?


397.

The unit of equilibrium constant for the following reaction is

 2NO2(g) N2O4 (g)

  • mol L-1

  • L mol-1

  • mol-1 L-1

  • equilibrium constant is unitless


398.

If the equilibrium constant for reaction (i) is 2, what is the equilibrium constant for reaction (ii)?

CO2 CO + 12O2    ....(i)

2CO2 + O2 2CO2 ...(ii)

  • 1/4

  • 1/2

  • 1

  • 2


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399.

For a gas in equilibrium with a liquid, the ratio of the concentration of the gas in the solution phase to that in the gaseous phase is constant at constant temperature, only if molecules undergo

  • ionisation

  • dissociation

  • isolation

  • reaction with solvent


400.

Which of the following comments about the following equilibrium reaction is the most correct?

H2SO4(aq) + NH3(aq)  HSO4- + NH4+(aq)

  • The equilibriumlies mostly to the right

  • The equilibrium lies mostly to the left

  • The equilibrium is exactly in between where the concentration of each of the reactants is exactly equal to the concentration of each of the products

  • The equilibrium depends on the temperature of the equilibrium reaction


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