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Q.

An increase in the concentration of the reactants of a reaction leads to change in :

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a

heat of reaction

b

collision frequency

c

activation energy

d

threshold energy

answer is C.

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Detailed Solution

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Answer: Effect of Increased Reactant Concentration on Reaction Rate

As the concentration of reactants increases, there is a greater number of reactant molecules in a given volume. This increase in the number of molecules per unit volume leads to an increase in the frequency of collisions between reactant molecules. As the concentration of reactant increases, these more frequent collisions lead to a higher probability that the collisions will have the necessary energy and proper orientation to result in successful reactions.

Furthermore, as the concentration of reactant increases, the rate of reaction typically increases, because more molecules are available to react at any given time. This increase in collision frequency and the corresponding rise in the likelihood of successful collisions ultimately results in a faster reaction rate. This relationship between concentration and reaction rate is an important concept in chemical kinetics.

In summary, as the concentration of reactant increases, both the collision frequency and the rate of successful collisions increase, leading to an overall increase in the reaction rate.

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