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Chemical Kinetics

Short Answer Type

61. The reaction 2H₂(g) + O₂(g) --> 2H₂O(g) is feasible. How is that hydrogen and oxygen mixture allowed to stand at room temperature shows no formation of water at all?

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62. For reaction NO₂ + CO → CO₂ + NO, the rate law is Rate = k[NO₂]². How many molecules of CO are involved in slowest process?

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63. State any one condition under which a bimolecular reaction may be kinetically of first order.

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64. Why is instantaneous rate preferred over average rate of reaction?

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65. The rate constant of a reaction is 3 x 10²h^–1. What is the order of reaction?

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66. A spontaneous reaction is not necessarily a fast reaction. Why?

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67. A order of reaction is found to be zero. Will its molecularity be zero?

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68. How is half period related to initial concentration for a second order reaction?

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69. In some cases it is found that a large number of colliding molecules have energy more than threshold value, yet the reaction is slow. Why?

Along with threshold frequency another criteria which is important for collision to be considered as an effective collision is proper orientation of molecules. The molecules may not be properly oriented at the time of collision for the reaction to take place.

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70. Define activation energy of a reaction.

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