For the reaction: A → Products, t_x/y represents the time in which x/y fraction of reactant converts — Chemical Kinetics Chemistry Question

💡 Solution & Explanation

(A) Zero order: t_1/3 = 18 => a/3k = 18 => a/k = 54. t_5/9 = (5/9)×54 = 30s (S). (B) First order: t_1/3 (leaving 2/3) is 18s. 19/27 conversion leaves 8/27 = (2/3)^3, taking 3×18 = 54s (P). (C) Second order: t_1/3 = 1/(2ka) = 4s => ka = 1/8. t_7/8 = 7/(ka) = 7×8 = 56s (R). Zero order: t_1/2 = 16 => a/k = 32. t_7/8 = (7/8)×32 = 28s (T). (D) First order: t_1/4 (leaving 3/4) is 16s. 7/16 conversion leaves 9/16 = (3/4)^2, taking 2×16 = 32s (Q). Therefore, correct answer is A-S, B-P, C-R,T, D-Q.