Chemical Kinetics

Short Answer Type

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Why is instantaneous rate preferred over average rate of reaction?

The rate of reaction at any time depends upon one of the reactants at that time which is not constant but goes on decreasing with time continuously. Therefore, instantaneously rate gives more correct information at that time as compared to average rate.
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    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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    Define activation energy of a reaction.
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    State any one condition under which a bimolecular reaction may be kinetically of first order.
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    A spontaneous reaction is not necessarily a fast reaction. Why?
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    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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    The rate constant of a reaction is 3 x 102 h–1. What is the order of reaction?
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    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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    How is half period related to initial concentration for a second order reaction?
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    A order of reaction is found to be zero. Will its molecularity be zero?
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