The rate constant of a reaction is 3 x 10h–1. What is the order of reaction?

The unit of a first order rate constant is s–1 therefore
k = 3 × 102 h-1 represents a first order reaction.

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

Rate = k[NO2]
No molecules of CO are involved in slowest step because CO is not present in rate law.
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