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Question

A reaction takes place in three steps, the respective rate constants are k1,k2 and k3. The overall rate constant k=k1k3k2. If energies of activation are 40, 30 and 20 kJ, the overall energy of activation is: (assuming 'A' to be constant for all)

A
10
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B
15
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C
30
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D
60
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Solution

The correct option is B 30
K=K1K3K2
lnK=lnK1+lnK3lnK2
But lnK=ERT+lnA
ERT+lnA=E1RT+lnAE3RT+lnA+E2RTlnA
or, Etotal=E1+E3E2=40+2030=30 kJ

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