Physical Chemistry MCQ with Answers

Physical Chemistry MCQ with Answers

281) The half life of a second order reaction is:

Answer is:

(1⁄K[A_o])

282) 16.0 gm of a radioactive substance is reduced to 0.50 g after 2 hours. Then the half life of the radioactive substance is:

Answer is:

24 minutes

283) The decomposition of N₂O into N₂ and O follows the second order kinetics with K = ( 5 x 10 ¹¹ mol⁻¹sec⁻¹) e ^{−29000K⁄T} then, the energy of activation of this reaction is:

Answer is:

241 KJ⁄mol

284) On doubling the concentration of reactant, half life of the reaction becomes (1⁄8) times the original vlue. Hence the energy of reverse reaction is:

Answer is:

65 KJ mol⁻¹

285) N₂O₅ decomposes according to the equation N₂O₅ → 2NO₂ + (1⁄2)O₂. What is the unit of the rate of this reaction?

Answer is:

mol litre⁻¹time⁻¹

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