JEE Main Chemistry question

The reason for almost doubling the rate of the reaction on increasing the temperature of the reaction system by 10°C is [J & K CET 2005]

(A)The value of threshold energy increases
(B)Collision frequency increases
(C)The fraction of the molecules having energy equal to threshold energy increasesCorrect
(D)Activation energy decreases

Answer: (C)

Solution

By kinetic theory, the collision frequency increases only weakly with temperature (roughly as ), which for a 10°C rise is a change of only about 1–2% — nowhere near enough to double the rate. The threshold energy and activation energy are fixed, temperature-independent properties of the

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Question ID VK-144338