16- The value of \( K \) at rate rule of reaction :- \( \begin{array}{ll}\text { a-will be constant } & \text { b-will be changed by changing the temperature } \\ \text { c-changes by changing the time } & d \text { - if concentration changes } K \text { will change. }\end{array} \)

The value of \( K \) in the context of reaction rate rules typically refers to the **rate constant**. Understanding how the rate constant behaves under different conditions is crucial in chemical kinetics. **Rate Constant (\( K \)) Dependence:** - **Temperature:** The rate constant \( K \) is **highly dependent on temperature**. According to the **Arrhenius equation**, an increase in temperature generally increases the rate constant, leading to a faster reaction rate. Conversely, lowering the temperature decreases \( K \). - **Concentration:** The rate constant \( K \) is **independent of the concentrations** of reactants and products. It is a proportionality factor that relates the reaction rate to the concentrations of reactants. - **Time:** The rate constant \( K \) **does not change with time**. It remains constant for a given reaction under constant temperature conditions. **Analyzing the Options:** - **a. Will be constant:** This is **incorrect** because \( K \) changes with temperature. - **b. Will be changed by changing the temperature:** **Correct.** Temperature directly affects the rate constant. - **c. Changes by changing the time:** **Incorrect.** \( K \) does not depend on time. - **d. If concentration changes, \( K \) will change:** **Incorrect.** \( K \) is independent of concentration changes. **Conclusion:** The correct statement regarding the rate constant \( K \) is: **Answer:** **b – K will be changed by changing the temperature**