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(D) For a collision to be effective,the colliding molecules must possess energy equal to or greater than a specific value known as the threshold energ

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increase in the number of effective collisions

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(D) For a collision to be effective,the colliding molecules must possess energy equal to or greater than a specific value known as the threshold energy. At room temperature,most reactant molecules have energy less than this threshold value. When the temperature increases,the kinetic energy of the reactant molecules increases,leading to a higher fraction of molecules possessing energy equal to or greater than the threshold energy. Consequently,the number of effective collisions per unit time increases,which results in an increase in the rate of reaction.

The rate of reaction increases with a rise in temperature because of:

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