Seema Saini Solutions for Chapter: Chemical Kinetics, Exercise 3: DPP 4.3

Two substances $\mathrm{A} \left({\mathrm{t}}_{1/2}=5 \min \right)$ and  $\mathrm{B} \left({\mathrm{t}}_{1/2}=15 \min \right)$ are taken in such a way that initially$\left[\mathrm{A}\right]=4\left[\mathrm{B}\right]$. What is the time after which both the concentration will be equal? (Assuming reactions are of $1^{\mathrm{st}}$ order)

The rate constant for the reaction $\mathrm{A}\to \mathrm{B}$ is $2\times {10}^{-4}$ $\mathrm{L} {\mathrm{mol}}^{-1} {\sec }^{-1}$. Determine the concentration of $\mathrm{A}$ at which rate of the reaction is$(1/12)\times {10}^{-5} \mathrm{M} {\sec }^{-1}$.

In the presence of $\mathrm{HCl}$, sucrose gets hydrolysed into glucose and fructose. The concentration of sucrose was found to be reduced from $0.4 \mathrm{M}$ to $0.2 \mathrm{M}$ in $1$ hour and to $0.1 \mathrm{M}$ in total of $2$ hours. What is the order of the reaction is?

The specific rate constant of a first order reaction is independent of the:

For a 1^st order reaction:

$2{\mathrm{N}}_2{\mathrm{O}}_5 \left(\mathrm{g}\right)\to 4{\mathrm{NO}}_2 \left(\mathrm{g}\right)+{\mathrm{O}}_2 \left(\mathrm{g}\right)$

Which of the following relationship(s) are correct for $1^{\mathrm{st}}$ order reaction?

In a $1^{\mathrm{st}}$ order reaction, amount of the substance left after $\mathrm{n}$ half lives and average life of a $1^{\mathrm{st}}$ order reaction respectively are:

If the reactant $\text{'}\mathrm{A}\text{'}$ is gaseous and pressures are measured instead of molar concentrations, then for reactions of zero order: