Chemical Kineti...

A freshly prepared radio medicine has half life $$2$$ hours. Its activity is $$64$$ times the permissible safe value. The minimum time after which it would be possible to treat the patients with the medicine is:

For an endothermic reaction, where $$\Delta H$$ represents the enthalpy of reaction, the minimum value for the energy of activation will be:

A first-order reaction has a half-life of $$14.5\ hrs$$. What percentage of the reactant will remain after $$24\ hrs$$?

The rates of a certain reaction at different time intervals are as follows:
$$\begin{matrix} Time(second) & 0 & 10 & 20 \\ Rate(mol\ L^{-1}s^{-1}) & 1.8\times { 10 }^{ -2 } & 1.82\times { 10 }^{ -2 } & 1.79\times { 10 }^{ -2 } \end{matrix}$$
The reaction is of:

Which one of the following is not a first order reaction?

For a zero order reaction which of the following relation is correct, where $$t_{1/2}\ and\ a$$ are half-life and initial concentration respectively.

The specific rate constant of a first order reaction depends on:

Reaction, $$A+B\longrightarrow C+D+38kcal$$ has activation energy $$20kcal$$. Activation energy for the reaction, $$C+D\longrightarrow A+B\quad $$ is:

At $$500$$ $$K$$, the half-life period of a gaseous reaction at an initial pressure of $$80$$ $$kPa$$ is $$350$$ $$sec$$. When the pressure is $$40$$ $$kPa$$, the half life period is $$175$$ $$sec$$; the order of the reaction is:

Which of the following is a first order reaction?