Chemistry - Chemical Kinetics Question with Solution | TestHub

Question Explanation: Find which of the following statements are true.

Concept: This question is based on zero order reaction.

Solution:

Step 1: By definition, the rate law for a zero-order reaction is $Rate=k[A{]}_0^{}=k$. This confirms that the rate is independent of reactant concentration, making statement 2 true.

Step 2: The rate constant $k$ is temperature-dependent according to the Arrhenius equation $k=A{e}^{-E_a/RT}$, so the reaction rate also depends on temperature. Thus, statement 1 is false.

Step 3: The half-life for a zero-order reaction is given by $t_{1/2}=\frac{[A{]}_0}{2k}$. This shows a direct dependence on the initial reactant concentration, making statement 3 true.

Step 4: The units of the rate constant $k$ for a zero-order reaction are concentration $\cdot$ time⁻¹, which is mol L⁻¹ s⁻¹. Therefore, statement 4 is true.

Final Answer: Option (B, C, and D)