Regarding the half-life period of a first-ord | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) For a first-order reaction,the half-life is given by $t_{1/2} = \frac{0.693}{k}$.$(A)$ It is independent of initial concentration,which is true.$(

Vedclass · Accepted Answer

It increases with increase of temperature.

Vedclass · Answer

(D) For a first-order reaction,the half-life is given by $t_{1/2} = \frac{0.693}{k}$.$(A)$ It is independent of initial concentration,which is true.$(B)$ It depends on the rate constant $k$,which is temperature-dependent according to the Arrhenius equation $k = Ae^{-E_a/RT}$. Thus,it is not independent of temperature.$(C)$ $A$ catalyst provides an alternative pathway with lower activation energy,increasing $k$ and decreasing $t_{1/2}$,which is true.$(D)$ As temperature increases,$k$ increases,so $t_{1/2}$ decreases. Therefore,the statement that it increases with an increase in temperature is false.

Regarding the half-life period of a first-order reaction,which one of the following statements is generally false?

Similar Questions

For a first-order reaction $SO_2Cl_2 \to SO_2 + Cl_2$ at $320\, ^\circ C$,the rate constant is $2.2 \times 10^{-5}\, s^{-1}$. What percentage $(\%)$ of $SO_2Cl_2$ will decompose upon heating for $90\, min$?

For a first-order reaction,the rate constant is $3 \times 10^{-6} \, s^{-1}$. If the initial concentration is $0.10 \, M$,the initial rate is.........

$A$ reaction has a rate constant $k = 2.4 \times 10^{-4} \ s^{-1}$. Find the ratio of $t_{99.9}$ to $t_{50}$.

For a first order reaction $A \rightarrow \text{Products}$,initial concentration of $A$ is $0.1 \, M$,which becomes $0.001 \, M$ after $5 \, \min$. Rate constant for the reaction in $\min^{-1}$ is .... .

In the reaction $2N_2O_5 \to 4NO_2 + O_2$,the initial pressure is $500 \ atm$ and the rate constant $K$ is $3.38 \times 10^{-5} \ s^{-1}$. After $10 \ minutes$,the final pressure of $N_2O_5$ is ........ $atm$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module