Consider an endothermic reaction, X → Y with activation energies Eb and Ef respectively for the backward and forward reactions, respectively. In general,
Eb < Ef
Eb > Ef
Eb = Ef
there is no definite relation between Eb and Ef
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Under the same reaction conditions, initial concentration of 1.386 mol dm–3 of a substance becomes half in 40 seconds and 20 seconds through first order and zero order kinetics respectively. Ratio $\left(\dfrac{k_1}{k_0}\right)$ of the rate constants for first order (k1) and zero order (k0) of the reaction is