A) The degree of dissociation is equal to \[(1-{{e}^{-kt}})\]
B) A plot of reciprocal concentration of the reactant vs time gives a straight line
C) The time taken for the completion of 75% reaction is thrice the \[{{t}_{1/2}}\] of the reaction
D) The pre-exponential factor in the Arrhenius equation has the dimension of time \[{{T}^{-1}}\]
Correct Answer: A
Solution :
is correct because degree of dissociation \[=1-{{e}^{-kt}}\] at any time t. is wrong because plot of log [A] vs t is a straight line is wrong because time taken for 75% reaction is two half life. is correct because in \[k=A{{e}^{-{{E}_{a}}/RT}}\],\[{{E}_{a/RT}}\] is dimensionless hence A has the unit of K.
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