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Question

Identify the order of the reaction from the following rate constants respectively
a. k=7.06×103 mol1 L s1
b. k=5.60×105 s1
c. k=1.25×102 mol L1 s1
d. k=1.25×102 mol2 L2 s1

A
0,1,2,3
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B
2,1,0,3
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C
3,1,0,2
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D
3,0,1,2
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Solution

The correct option is B 2,1,0,3
Here we can identify the order of the reaction from the unit of the rate constants given.
We know, unit of rate constant =[1unit of concentration]n1×time1
=[litremol](n1)×sec1
Where, n = order of the reaction

(a) k=7.06×103 mol1 L s1
So here, n=2 and hence it is a second order reaction.

(b) k=5.60×105 s1
So here, n=1 and hence it is a first order reaction.

(c) k=1.25×102 mol L1 s1
So here, n=0 and hence it is a zero order reaction.

(d) k=1.25×102 mol2 L2 s1
So here, n=3 and hence it is a third order reaction.

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