On increasing temperature, the equilibrium constant of exothermic

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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.


213.

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

  • 4.89

  • 1.28

  • 4.76

  • 2.56


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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


B.

decreases and increases

For A + B kbkf C + D; K = kfkb

For exothermic reaction, kf decreases with increase of temperature so that K decreases.

For endothermic reaction, kf increases with increase of temperature so that K increases.


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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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