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


A spontaneous reaction means that it has tendency to occur of it self, giving enough time, without side intervation it simply predicts the direction of reaction or feasibility of reaction and not at all the rate of the reaction.
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Define activation energy of a reaction.

Activation energy is the extra amount of energy that is supplied from outside so that the colliding particles must produce effective collision i.e., have total energy equal to the threshold energy.

 

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

The half life of a second order reaction is inversely proportional to the initial concentration of the reactants.
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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?

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

No, molecularity of reaction cannot be zero.
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