Chemical Kinetics

When the initial concentration of a zero order reaction is doubled, the half-life of the reaction is:

Identify the correct values to be plotted in the graph, the slope of which can be used to determine the activation energy of a reaction.

$60 \%$ of a first order reaction was completed in 60 min , then $50 \%$ of the same reaction can be completed in: $[\log 4=0.60, \log 5=0.69]$

Rate law can be determined from a balanced chemical equation if

The rate constants for two different reactions, $\mathrm{k}_1$ and $\mathrm{k}_2$ are $10^{16} \cdot \mathrm{e}^{-2000 / \mathrm{T}}$ and $10^{15} \cdot \mathrm{e}^{-1000 / \mathrm{T}}$ respectively. The temperature at which $k_1=k_2$ is

In the synthesis of $\mathrm{NH}_3$ from $\mathrm{H}_2$ and $\mathrm{N}_2$, if $6 \times 10^{-2}$ mole of hydrogen disappears in 10 minutes, the number of moles of $\mathrm{NH}_3$ formed in 0.3 minutes is:

\(\text { When the concentration of the reactant in a given reaction is halved and if the rate of reaction is halved, the order of the reaction is: }\)

Which of the following factors is altered by the addition of a catalyst during a chemical reaction?

The initial pressure of the system before decomposition for a first order gas phase reaction $A_{(g)} \rightarrow B_{(g)}+C_{(g)}$ was $\mathrm{P}_{\mathrm{i}}$. After lapse of time ' t ', total pressure of the system increased by ' x ' uni...

A first order reaction is $50 \%$ complete in 30 minutes at 300 K and in 10 minutes at 320 K . The activation energy of the reaction ( $E_a$ ) is: $\left[R=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} ; \log 2=0.3010 ; \log 3=0.477...

For a given reaction of the type $\frac{3}{5} X(a q) \rightarrow \frac{1}{2} Y(a q)+Z(g)$, the correct expression for the rate of disappearance of $X$ with reference to $Y$ is ___________

$\mathrm{X} \rightarrow 2 \mathrm{Y}$ is a first order reaction where $1.0 \mathrm{~mol} / \mathrm{L}$ of the reactant yields $0.4 \mathrm{~mol} / \mathrm{L}$ of Y in 200 minutes. Calculate the half-life period of the reaction in minutes.

Two chemical reactions of the same order have equal Frequency factor value. Their Activation energies differ by $26.8 \mathrm{~kJ} / \mathrm{mol}$. At 300 K if $k_2=x k_1$ find the value of $x$.

Two statements, One Assertion (A) and the other Reason (R) are given. Choose the right option.
Assertion: The rate constant $(\mathrm{k})$ for a chemical reaction gets nearly doubled for a $10^0$ rise in temperature.
Reason: The number of b...

The following results were obtained during study of the reaction $2 \mathrm{NO}(\mathrm{g})+\mathrm{Cl}_2(\mathrm{~g}) \rightarrow 2 \mathrm{NOCl}(\mathrm{g})$. Determine the value of $[\mathrm{X}]$ in $\mathrm{mol} / \mathrm{L}$

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The order of a reaction $\mathrm{W}+\mathrm{X} ---- \rightarrow \mathrm{Y}+\mathrm{Z}$ with respect to W is 3 and with respect to X is 1. If the concentrations of both W and X are tripled, the rate of reaction will increase by _________ tim...

When the temperature of a reaction $\mathrm{A}+\mathrm{B} \rightarrow \mathrm{C}$ is increased from 300 K to 310 K the rate constant increases by $12 \%$. What is the Activation energy of the reaction?

During a chemical reaction $\mathrm{X} \rightarrow \mathrm{Y}$, the rates of reaction starting with initial concentrations of X as $4.0 \times 10^{-3} \mathrm{M}$ and $2.0 \times 10^{-3} \mathrm{M}$ are $4.8 \times 10^{-4} \mathrm{~mol} \ma...

Choose the correct statement.

The decomposition of $\mathrm{PH}_3$ follows first order kinetics. The time required for $3 / 4^{\text {th }}$ of $\mathrm{PH}_3$ to decompose is 75.76 s . Calculate the fraction of original amount of $\mathrm{PH}_3$ which will remain after...

(i) and (ii) are 2 chemical reactions carried out at TK.
(i). $\mathrm{X} \rightarrow \mathrm{Y}+\mathrm{W}$ with $\mathrm{k}_1$ as rate constant.
(ii). $\mathrm{X} \rightarrow \mathrm{Z}+\mathrm{W}$ with $k_2$ as rate constant.
The Activat...

The hydrogenation of Ethyne is carried out at 600 K . The same reaction when carried out in presence of a catalyst maintaining the same rate constant, the temperature required is only 400 K . If the catalyst lowers the Activation energy of ...

The time needed for completion of $80 \%$ is $y$ times the half-life period of a first order reaction. What is the value of $y$ ?

Which one of the following is incorrect?

The rate constant for a zero order reaction $\mathrm{A} \rightarrow \mathrm{B}+\mathrm{C}$ is $6.0 \times 10^{-3} \mathrm{molL}^{-1} \mathrm{~s}^{-1}$.
What would be the time taken for the initial concentration of A to decrease from 0.2 M t...

Given below are 4 graphs [A], [B], [C] and [D]

Identify the 2 graphs that represent a Zero order reaction?

The rate constant for the reaction \(\mathrm{A} \rightarrow \mathrm{B}+\mathrm{C}\) at \(500 \mathrm{~K}\) is given as \(0.004 \mathrm{~s}^{-1}\). At what temperature will the rate constant become \(0.014 \mathrm{~s}^{-1}\) ? $$\mathrm{E}_{...

A given chemical reaction is represented by the following stoichiometric equation.
\(3 X+2 Y+\frac{5}{2} Z \rightarrow P_1+P_2+P_3\)
The rate of reaction can be expressed as _________.

For the reaction \(\mathrm{Cl}_{2(\mathrm{~g})}+2 \mathrm{NO}_{(\mathrm{g})} \rightarrow 2 \mathrm{NOCl}_{(\mathrm{g})}\), the following data was obtained:

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The time required for \(80 \%\) of a first order reaction is "\(y\)" times the half-life period of the same reaction. What is the value of "\(y\)"?

In the presence of a catalyst at a given temperature of \(27^{\circ} \mathrm{C}\), the Activation energy of a specific reaction is reduced by \(100 \mathrm{~J} / \mathrm{mol}\). What is the ratio between the rate constants for the catalysed...

For a reaction \(5 X+Y \rightarrow 3 Z\), the rate of formation of \(Z\) is \(2.4 \times 10^{-5} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\) Calculate the average rate of disappearance of \(\mathrm{X}\).

The Activation energy for the reaction \(A \rightarrow B+C\), at a temperature \(\mathrm{TK}\) was \(0.04606 \mathrm{~RT} \mathrm{~J} / \mathrm{mol}\). What is the ratio of Arrhenius factor to the Rate constant for this reaction?

The following data was recorded for the decomposition of XY compound at 750K

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For a given reaction, ,\(\mathrm{X}(\mathrm{g})+\mathrm{Y}(\mathrm{g} \rightarrow \mathrm{Z}(\mathrm{g})\), the order of reaction with respect to \(\mathrm{X}\) and \(\mathrm{Y}\) are \(\mathrm{m}\) and \(\mathrm{n}\) respectively. If the c...

The half-life for a zero order reaction is

The rate of appearance of bromine is related to the disappearance of bromide ion in the equation given below is:
$$\mathrm{BrO}_3^{-} \text {(aq) }+5 \mathrm{Br}^{-} \text {(aq) }+6 \mathrm{H}^{+} \rightarrow 3 \mathrm{Br}_2(\mathrm{l})+3 \...

For the reaction, \(\mathrm{A}+3 \mathrm{~B} \rightarrow 2 \mathrm{C}+\mathrm{D}\), the concentration of \(\mathrm{A}\) changes from 0.0150 to 0.0125 in 1 minute. The rate of formation of \(\mathrm{C}\) in $$\mathrm{mol} \mathrm{~L}^{-1} \m...

The temperature \((\mathrm{T})\) and rate constant \((\mathrm{k})\) for a first order reaction \(\mathrm{R} \rightarrow \mathrm{P}\), was found to follow the equation \(\log \mathrm{k}=-(2000) \frac{1}{\mathrm{~T}}+8.0\). The pre-exponentia...

Given below a first order reaction in the gas phase
\(\mathrm{A}(\mathrm{g}) \rightarrow \mathrm{B}(\mathrm{g})+\mathrm{C}(\mathrm{g})\)
If the initial pressure of the system is \(\mathrm{P}_{\mathrm{i}}\) and the total pressure at $$\mathr...

Given below are graphs showing the variation in velocity constant with temperature on Kelvin scale. Identify the graph which represents Arrhenius equation.

Match the details given in Column I with those given in Column II

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The rate constant for a First order reaction at \(560 \mathrm{~K}\) is \(1.5 \times 10^{-6}\) per second. If the reaction is allowed to take place for 20 hours, what percentage of the initial concentration would have converted to products?

For a reaction of the type, \(2 \mathrm{X}+\mathrm{Y} \rightarrow \mathrm{A}+\mathrm{B}\), the following is the data collected:

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A first order reaction proceeds to \(90 \%\) completion. What will be the approximate time taken for \(90 \%\) completion in relation to \(t_{1 / 2}\) of the reaction?

For a reaction, \(2 A+B \longrightarrow\) products,
If concentration of \(B\) is kept constant and concentration of \(A\) is doubled then rate of reaction is

At \(300 \mathrm{~K}\), the half-life period of a gaseous reaction at an initial pressure of \(40 \mathrm{~kPa}\) is 350 s. When pressure is \(20 \mathrm{~kPa}\), the half-life period is 175 s. What is the order of the reaction?

How much faster would a reaction proceed at \(25^{\circ} \mathrm{C}\) than at \(0^{\circ} \mathrm{C}\) if the activation energy is \(65 \mathrm{~kJ}\)?

For the reaction 2N\(_2\)O\(_5\) \(\to\) 4NO\(_2\) + O\(_2\).
If initial pressure is 100 atm and rate constant \(k\) is 3.38 \(\times\) 10\(^{-5}\) s\(^{-1}\). after 20 min the final pressure of N\(_2\)O\(_5\) will be

Which of the following statement is incorrect about activation energy?