For a first order reaction,A. (a) The degree of dissociation isequal to `(1-e^(-Kt))`B. (b) A plot of reciprocal concentration of the reactant vs. time gives a straight lineC. (c ) The time taken for the completion of `75%` reaction is thrice the `t_(1//2)` of the reactionD. (d) The pre-exponential factor in the Arrhenius equation has the dimension of time, `(T^(-1))`

For a first order reaction,A. (a) The degree of dissociation isequal t

1.	For a first order reaction,A. (a) The degree of dissociation isequal to `(1-e^(-Kt))`B. (b) A plot of reciprocal concentration of the reactant vs. time gives a straight lineC. (c ) The time taken for the completion of `75%` reaction is thrice the `t_(1//2)` of the reactionD. (d) The pre-exponential factor in the Arrhenius equation has the dimension of time, `(T^(-1))`
Answer» Correct Answer - a, d For first order reaction, if degree of dissociation is `alpha`, Then `K=2.303/t"log"1/(a-alpha)` or `K. t="log"1/(1-alpha)=-log(1-alpha)` or `e^(-K.t)=1-alpha` `alpha=1-e^(-Kt)` According to Arrhenius equation, `K=A.e^(-E_(a)//RT)` Thus, dimension of `A` in the above expression is the same as that of rate constant, and for the I order reaction of K is `time^(-1)`.

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