Chemical Kinetics

Which one of the following graph is not applicable for a 1st order reaction ($R \rightarrow P$)?

For a reaction having three steps, the overall rate constant is $k = \dfrac{k_1 k_2}{k_3}$. The values of $E_{a_1}, E_{a_2}$ and $E_{a_3}$ (activation energies stepwise) are $40$, $50$ and $60$ kJ mol$^{-1}$ respectively. Then the overall $...

For a 1st order change $R \rightarrow P$, the concentration of Reactant R changes from $0.1$ M to $0.025$ M in $40$ minutes. The rate of reaction when the concentration of R is $0.01$ M is ____

The activation energy for the reaction $X \rightarrow Y$ is $150\text{ kJ mol}^{-1}$. The change in enthalpy for the above reaction is $-135\text{ kJ mol}^{-1}$. Then the activation energy for $Y \rightarrow X$ is

\(\text { In the given graph, } \mathrm{E}_{\mathrm{a}} \text { for the reverse reaction will be }\)

For the reaction $2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \rightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}$ initial concentration of $\mathrm{N}_2 \mathrm{O}_5$ is $2.0 \mathrm{molL}^{-1}$ and after 300 min , it is...

Half-life of a first order reaction is 20 seconds and initial concentration of reactant is 0.2 M . The concentration of reactant left after 80 seconds is

Catalysts are used to increase the rate of a chemical reaction. Because it

For the reaction, $\mathrm{PCl}_5 \longrightarrow \mathrm{PCl}_3+\mathrm{Cl}_2$, rate and rate constant are $1.02 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$ and $3.4 \times 10^{-5} \mathrm{~s}^{-1}$ respectively at a gi...

Which one of the following does not represent Arrhenius equation?

For the reaction, $A \rightleftharpoons B, E_a=50 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $\Delta H=-20 \mathrm{~kJ} \mathrm{~mol}^{-1}$. When a catalyst is added $E_a$ decreases by $10 \mathrm{~kJ} \mathrm{~mol}^{-1}$. What is the $E_a$ for t...

The rate constant \(k_1\) and \(k_2\) for two different reactions are \(10^{16} \times e^{-2000 / T}\) and \(10^{15} \times e^{-1000 / T}\) respectively. The temperature at which \(k_1=k_2\) is

For a reaction, the value of rate constant at \(300 \mathrm{~K}\) is \(6.0 \times 10^5 \mathrm{~s}^{-1}\). The value of Arrhenius factor \(A\) at infinitely high temperature is

In which one of the following reactions, rate constant has the unit \(\mathrm{mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\) ?

The rate of the reaction, \(\mathrm{CH}_3 \mathrm{COOC}_2 \mathrm{H}_5+\mathrm{NaOH} \longrightarrow \mathrm{CH}_3 \mathrm{COONa}+\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}\) is given by the equation, rate $$=k\left[\mathrm{CH}_3 \mathrm{COOC}_2...

A first order reaction is half completed in \(45 \mathrm{~min}\). How long does it need \(99.9 \%\) of the reaction to be completed?

Half-life of a reaction is found to be inversely proportional to the fifth power of its initial concentration, the order of reaction is

For \(n\)th order of reaction, half-life period is directly proportional to

Higher order \((>3)\) reactions are rare due to

The rate of a gaseous reaction is given by the expression \(k[A][B]^2\). If the volume of vessel is reduced to one half of the initial volume, the reaction rate as compared to original rate is

For a reaction, \(A+2 B \rightarrow\) Products, when concentration of \(B\) alone is increased half-life remains the same. If concentration of \(A\) alone is doubled, rate remains the same. The unit of rate constant for the reaction is

If the rate constant for a first order reaction is \(k\), the time \((t)\) required for the completion of \(99 \%\) of the reaction is given by

The time required for \(60 \%\) completion of a first order reaction is \(50 \mathrm{~min}\). The time required for \(93.6 \%\) completion of the same reaction will be

The rate constant of a reaction is given by \(k=P Z e^{-E_a / R T}\) under standard notation. In order to speed up the reaction, which of the following factors has to be decreased?

For an elementary reaction \(2 A+3 B \rightarrow 4 C+D\) the rate of appearance of $C$ at time '\(T\)' is \(2.8 \times 10^{-3} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~S}^{-1}\). Rate of disappearance of \(B\) at '\(t\)' $t$ will be

Which is a wrong statement?

1L of \(2 \mathrm{M~CH}_3 \mathrm{COOH}\) is mixed with 1L of \(3 \mathrm{M} \mathrm{~C}_2 \mathrm{H}_5 \mathrm{OH}\) to form an ester. The rate of the reaction with respect to the initial rate when each solution is diluted with an equal vo...

The plot of \(t_{1 / 2} \mathrm{~v} / \mathrm{s}~[R]_0\) for a reaction is a straight-line parallel to \(X\)-axis. The unit for the rate constant of this reaction is

The value of rate constant of a pseudo first order reaction

The temperature coefficient of a reaction is
2. When the temperature is increased from $30^{\circ} \mathrm{C}$ to $90^{\circ} \mathrm{C}$, the rate of saction is increased by

For the reaction, $2 \mathrm{SO}_2+\mathrm{O}_2 \rightleftharpoons 2 \mathrm{SO}_3$, the rate of disappearance of $\mathrm{O}_2$ is $2 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$. The rate of appearance of $\mathrm{SO}_3...

Which of the following statement is incorrect?

Which of the following statement is in accordance with the Arrhenius equations?

For a reaction $\frac{1}{2} A \rightarrow 2 B$ rate of disappearance of $A$ is related to rate of appearance of $B$ by the expression