Chemical Kinetics Test

Result

Chemical Kinetics Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

The rate of a certain reaction increases by 2.5 times when the temperature is raised from 300 K to 310 K. If 'k' is the rate constant at 300 K, then the rate constant at 310 K will be equal to

A
k

B
2k

C
2.5k

D
3k

Solution

The rate of the reaction is directly proportional to the rate constant. As the rate of the reaction increases by 2.5 times, the rate constant will become 2.5 times.

Alternatively, temperature coefficient = 2.5
Question 2
1 / -0

A large increase in the rate constant with small rise in temperature for a gaseous reaction is indicative of

A
large number of collisions at higher temperature

B
high value of activation energy of the reaction

C
high value of the pre-exponential factor

D
increase in the average speed of the molecules

Solution

Small increase in e^—E/RT resulting in large increase in k is due to high value of A.
Question 3
1 / -0

Velocity constant of a reaction at 290 K was found to be 3.2 x 10^-3. At 300 K, it will be

A
1.28 x 10^-2

B
9.6 x 10^-3

C
6.4 x 10^-3

D
3.2 x 10^-4

Solution

For 10^oC rise, the velocity constant becomes nearly double.