The pKa values of four carboxylic acids are given below. Ide

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 Multiple Choice QuestionsMultiple Choice Questions

211.

The pH of a buffer solution made by mixing 25 mL of 0.02 M NH4OH and 25 mL of 0.2 M NH4Cl at 25° is pKb of NH4OH = 4.8)

  • 5.8

  • 8.2

  • 4.8

  • 3.8


212.

Which one of the following statements is not correct?

  • The pH of 1.0 ×10-8 M HCl is less than 7.

  • The ionic product of water at 25°C is 1.0 ×10-14 mol2L-2

  • Cl- is a Lewis acid

  • Bronsted Lowry theory cannot explain the acidic character of AlCl3.


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213.

The pKvalues of four carboxylic acids are given below. Identify the weakest carboxylic acid.

  • 4.89

  • 1.28

  • 4.76

  • 2.56


A.

4.89

The more the value of pKa, compound will be less acidic indicating the less value of Ka and smaller the value of pKa the compound will be more acidic. Therefore, the pKa of the weakest carboxylic acid is 4.89.


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214.

On increasing temperature, the equilibrium constant of exothermic and endothermic reactions, respectively

  • increases and decreases

  • decreases and increases

  • increases and increases

  • decreases and decreases


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215.

What is the pH of the NaOH solution when 0.04 g of it dissolved in water and made to 100 mL solution?

  • 2

  • 1

  • 13

  • 12


216.

Which one of the following is correct with respect to basic character?

  • P(CH3)3 > PH3

  • PH3 > P(CH3)3

  • PH3 > NH3

  • PH3 = NH3


217.

If the ionc product of Ni(OH)2 is 1.9× 10-15, the molar solubility of Ni(OH)in 1.0 M NaOH

  • 1.9 × 10-18 M

  • 1.9 × 10-13 M

  • 1.9 × 10-15 M

  • 1.9 × 10-15 M


218.

40 mL of x M KMnO4 solution is required to react completely with 200 mL of 0.02 M oxalic acid solution in acidic medium. The value of x is

  • 0.04

  • 0.01

  • 0.03

  • 0.02


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219.

At 400 K, in a 1.0 L vessel, N2O is allowed to attain equilibrium, N2O4 (g)  2NO2 (g)

At equilibrium, the total pressure is 600 mm Hg, when 20% of N2O4 is dissociated. The value of KP for the reaction is

  • 50

  • 100

  • 150

  • 200


220.

In which of the following salts, only cationic hydrolysis is involved?

  • CH3COONH4

  • CH3COONa

  • NH4Cl

  • Na2SO4


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