NEET Chemistry Chemical Kinetics Questions Solved


Assertion : For a first order reaction, the degree of dissocation is equal to 1-e-kt

Reason  : For a first order reaction, the pre-exponential factor in the Arrhenius equation has the dimension of time-1

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(B). For a first order reaction,

[A]f [A]0 exp(- kt)

[A]0- [A]f= [A]0- [A]0 exp( -kt) [A]0 (1- exp( -kt)or [A]0- [A]f[A]0 (1- exp( -kt)

So, degree of dissocation = (1 – exp (–kt)

For a first order reaction,

k=A exp-Ea/RT=A expJ mol-1J mol-1K-1K

Thus, the units of A are the same as that for k. For a first order reaction, the units of k are those of time-1. So the units of A are also those of time-1

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