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
0.5 mol–1 dm3
1.0 mol–1 dm–3
1.5 mol dm–3
2.0 mol–1 dm–3