The rate of gas phase chemical reactions generally increases rapidly with rise in temperature. This is mainly because:

the collision frequency increases with temperature

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the fraction of molecules having energy in excess of the activation energy increases with temperature

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the activation energy decreases with temperature

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the average kinetic energy of molecules increases with temperature

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Solution

The correct option is B the fraction of molecules having energy in excess of the activation energy increases with temperature
The rate of gas-phase chemical reactions generally increases rapidly with the rise in temperature. This is mainly because the fraction of molecules having energy in excess of the activation energy increases with temperature.

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Similar questions

Which of the following statements are in accordance with the Arrhenius equation?
(a) Rate of a reaction increases with increase in temperature
(b) Rate of a reaction increases with a decrease in activation energy
(c) Rate constant decreases exponentially with an increase in temperature
(d) Rate of reaction decreases with a decrease in activation energy

Consider the Arrhenius equation given below and mark the correct option.
$k = A . e - \frac{E_{a}}{R T}$
(a) Rate constant increases exponentially with increasing activation energy and decreasing temperature
(b) Rate constant decreases exponentially with increasing activation energy and decreasing temperature
(c) Rate constant increases exponentially with decreasing activation energy and decreasing temperature
(d) Rate constant increases exponentially with decreasing activation energy and increasing temperature

Q. A catalyst:
(i) increases the average kinetic energy of reacting molecules
(ii) decrease the activation energy
(iii) alters the reaction mechanism
(iv) increases the frequency of collisions of reacting species.
The true statements are:

According to Maxwell, Boltzmann distribution of energy, ......... .
(a) the fraction of molecules with most probable kinetic energy decreases at higher temperatures
(b) the fraction of molecules with most probable kinetic energy increases at higher temperatures
(c) most probable kinetic energy increases at higher temperatures
(d) most probable kinetic energy decreases at higher temperatures

Q. When the temperature is increased, the speed of a chemical reaction usually increases because the
(1) Pressure has decreased
(2) molecules collide less frequently
(3) fractional of the molecules possessing the activation energy for the reaction increases

Which of the above option(s) is/ are correct?

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