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Effective collisions are when...

Effective collisions are when

A

molecules have attained the threshold energy

B

the molecules are in proper orientation

C

products are formed

D

all the above.

Text Solution

Verified by Experts

The correct Answer is:
D
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According to collision theory of chemical reactions, rate of a reaction depends upon collision frequency and fraction of effective collisions. The rate of a reaction generally increases with rise in temperature mainly because of increase in number of effective collisions. Arrhenius proposed a quantitative relation between rate constant and temperature as k= Ae^(-E_a//Rt) where E_a is activation energy. It is equal to the difference between threshold energy and average kinetic energy of reacting molecules. Which of the following plot will be linear ?

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Knowledge Check

  • The effective collisions between the reactant molecules at higher temperatures ________.

    A
    Increase
    B
    Decrease
    C
    Remains same
    D
    First increase then decrease

  • According to collision theory, rate of the reaction effects by which of the following: 1. reacting molecules must react in the presence of catalyst. 2. molecules must have energy equal to or high E_a 3. molecules must have effective collisions due to proper orientation. 4. none of these.

    A
    both 1 and 4
    B
    both 2 and 3
    C
    1, 2 and 3
    D
    1,2,3 and 4

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    Increase in rate of reaction with rise in temperature is mainly due to increase in collision frequency/effective collisions.

    Define collision frequency. Write short note on collision theory of chemical reactions.

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    Discuss the elastic collision between two bodies in two dimensions and obtain the expression for their velocities after collision.

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