Question

in first order reaction,if A=0.620M and 0.520M after 15.0min. What is the value of the rate constant​

Answer 1

Explanation:

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Class 12

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Question

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For a first order reaction, (A) → product, the concentration of A changes from 0.1 M to 0.025 M in 40 minutes. The rate of reaction when the concentration of A is 0.01 M, is:

Hard

JEE Mains

Solution

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Correct option is

B

3.47×10

−4

Mmin

−1

For first order reaction,

k=

40

2.303

log

0.025

0.1

=

40

2.303

log 4

=

20

2.303

log 2

=

20

2.303

×0.301=0.0347

k=0.0347

Rate=k[A]

Rate=0.0347×10

−2

=3.47×10

−4

Mmin

−1