The temperature dependence of rate constant (k) of a chemical rea

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 Multiple Choice QuestionsMultiple Choice Questions

371.

Which of the following is not a Lewis base ?

  • NH3

  • H2O

  • AlCl3

  • None of these


372.

The solubility in water of a sparingly soluble salt AB2 is 1.0 × 10-5 mol L-1. Its solubility product number will be

  • 4 × 10-15

  • 4 × 10-10

  • 1 × 10-15

  • 1 × 10-10


373.

The correct order of increasing basic nature for the bases NH3, CH3NH2 and (CH3)2NH is

  • CH3NH2 < NH3 < (CH3)2NH

  • (CH3)2NH < NH3 < CH3NH2

  • NH3 < CH3NH< (CH3)2NH

  • CH3NH< (CH3)2NH < NH3


374.

The solubility of CaF2 in pure water is 2.3 ×10-6 mol dm-3. Its solubility product will be:

  • 4.8 ×10-18

  • 48.66 ×10-18

  • 4.9 ×10-11

  • 48.66 ×10-15


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375.

Two moles of PCl5 were heated in a closed vessel of 2 L. At equilibrium 40% of PCl5 is  dissociated into PCl3 and Cl2.The,value of equilibrium constant is :

  • 0.53

  • 0.267

  • 2.63

  • 5.3


376.

What is the equilibrium expression for the reaction

P4 (s) + 5O2 (g)  P4O10 (s) ?

  • KcP4O10[P4][O2]5

  • KcP4O105[P4][O2]

  • Kc = [O2]5

  • Kc1[O2]5


377.

The pH value of 1/1000 N-KOH solution is :

  • 3

  • 10-11

  • 2

  • 11


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378.

The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation, k = Ae-E*/ RT. Activation energy (E*) of the reaction can be calculated by plating

  • log k vs 1T

  • log k vs 1log T

  • k vs T

  • k vs 1log T


A.

log k vs 1T

Arrhenius equation k = Ae-E/ RT

ln k = ln A - ERT

or, log k = log A - E2.303 RT

Hence, E is calculated with the help of slope of following


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379.

The heats of combustion of carbon monoxide at constant pressure and at constant volume at 27°C will differ from one another by :

  • 27 cal

  • 54 cal

  • 300 cal

  • 600 cal


380.

Microcosmic salt is

  • Na4P2O7

  • Na(NH4)HPO4

  • Na(NH3)HPO4H2O

  • MgNH4PO4


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