A large increase in the rate of a reaction for a rise in temperature is due to ____.
The decrease in the number of collisions
The increase in the number of activated molecules
The shortening of the mean free path
The lowering of the activation energy
Which of the following statements is not true according to collision theory of reaction rates?
Collision of molecules is a precondition for any reaction to occur
All collisions result in the formation of the products
Only activated collisions result in the formation of the products
Molecules which have acquired the energy of activation can collide effectively
According to the collision theory of chemical reactions ____.
A chemical reaction occurs with every molecular collision
Rate is directly proportional to the number of collisions per second
Reactions in the gas phase are always of zero order
Reaction rates are of the order of molecular speeds
According to the collision theory of reaction rates, rate of reaction increases with temperature due to ____.
Greater number of collisions
Greater velocity of the reacting molecules
Greater number of molecules have activation energy
None of the above
The reaction rate at a given temperature becomes slower, then ____.
The free energy of activation is higher
The free energy of activation is lower
The entropy changes
The initial concentration of the reactants remains constant
A rise in temperature increases the velocity of a reaction. It is because it results in ____.
An increased number of molecular collisions
An increased momentum of colliding molecules
An increase in the activation energy
A decrease in the activation energy
Collision theory is applicable to ____.
First order reactions
Zero order reactions
Intra molecular reactions
A graph plotted between log K vs 1/T for calculating activation energy is shown by ____.
k is equilibrium constant
A is adsorption factor
R is Rydberg’s constant
The activation energy of a reaction is zero. The rate constant of this reaction ____.
Increases with increase of temperature
Decreases with an increase of temperature
Decreases with decrease of temperature
Is independent of temperature