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    Chemical Kinetics

    Multiple Choice QuestionsShort Answer Type

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    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?

    The activation energy of the reaction is very high at room temperature, hence no combination of H2 and O2 is possible at room temperature.
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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 102 h–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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