Chemistry - Chemical Kinetics Question with Solution | TestHub

A) Zero order: Reaction completes in finite time (P). Integrated rate law: $[A{]}_t=[A{]}_0-kt$. So, $[A{]}_t$ vs $t$ is a straight line, which matches $\frac{1}{[A{]}_t^{n-1}}$ vs $t$ for $n=0$ (Q). Rate decreases as concentration decreases (S).

B) First order: Rate decreases during reaction (S). Can be elementary (unimolecular) (T).

C) Second order: $\frac{1}{[A{]}_t}$ vs $t$ is a straight line (Q). Half-life $t_{1/2}=\frac{1}{k[A{]}_0}$, so $t_{1/2}$ increases when $[A{]}_0$ decreases (R). Rate decreases (S).

D) Half order: Reaction completes in infinite time (P). Rate decreases (S).

Matches: A -> P, Q, S; B -> S, T; C -> Q, R, S; D -> P, S.

Option B is the best match.