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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.

If one of the two reactants is present in excess.
In above condition bimolecular reaction may be kinetically 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?

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70. Define activation energy of a reaction.

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