List of top Chemistry Questions on Chemical Kinetics

The \( 1^{\text{st}} \) ionization enthalpy for Mg is +737 kJ/mol. The most probable estimated value of the \( 2^{\text{nd}} \) ionization enthalpy of Mg is _______ kJ/mol.

Consider the first order reaction R → P. The fraction of molecules decomposed in the given first order reaction can be expressed as

The rate constant of a reaction is \[ 1.5\,mol^{-3/2}L^{3/2}s^{-1} \] What is the order of this reaction?

Given below are two statements Statement-I: Rate of first order reaction decreases with time Statement-II: Rate of zero order reaction decreases with time

The rate constant of a first-order reaction becomes four times when temperature changes from 300 K to 320 K. Find activation energy.

The activation energy for a reaction at T (K) was found to be \(2.303RT\ J\ mol^{-1}\). The ratio of rate constant to Arrhenius factor is

At \(T\)(K), the following data is obtained for the decomposition of \(A(g)\), which follows first order kinetics \[ A(g)\rightarrow B(g)+C(g) \] \[ \begin{array}{|c|c|} \hline \text{Time (s)} & \text{Total pressure (atm)} \hline 0 & 0.5 100 & 0.6 x & 0.65 \hline \end{array} \] What is \(x\) (in s)? \[ (\log1.25=0.097,\qquad \log1.4285=0.1549) \]

If the rate constant of a first-order reaction is $4.606\times10^{-3}\,\mathrm{s^{-1}}$, then the time taken (in seconds) for the concentration of the reactant to decrease from $1.0\,\mathrm{M}$ to $0.1\,\mathrm{M}$ is:}

A first order reaction take \(30\) minutes for \(75\%\) decomposition, calculate its rate constant ?

Which of the following is an elementary reaction ?

What is the time required for 75 % completion of a first order reaction if rate constant is \(23.03 \text{minute}^{-1}\) ?

For a reaction \(\text{A}⟶\) product, \(k = 2\times 10^{-2} \text{s}^{-1}\). If the initial concentration of A is \(1.0 \text{mol dm}^{-3}\) find the value of \(log\frac{1}{[A]_t}\) after 100 second ?

In a first order reaction 20 millimole of reactant is lowered to 10 millimole in \(0.3010\) minute. Find rate constant of the reaction?

In first order reaction 20 millimole of reactant is reduced to 10 millimole in \(1\cdot 151\) minute. Find rate constant.

If time required for 90 % completion of a first order reaction is '\(t\)'. What is the time required for 99.9 % completion of reaction at same temperature?

If for a first-order reaction, \([A]_0 = 1.0 \text{M}\) and \([A]_t = 0.25 \text{M}\) after 276 s, find the value of the rate constant (k).

The rate constant of reaction is \(1.5\times 10^7 \text{s}^{-1}\) at 300 K and \(3.0\times 10^7 \text{s}^{-1}\) at 330 K. What is the activation energy for the reaction? [ \(R\times 2.303 = 19.15 \text{JK}^{-1}\text{mol}^{-1}\)]

The time required for \(90\%\) completion of a certain first order reaction is \(1\) hour. Calculate the time required for \(99.9\%\) completion of the same reaction.

A first order reaction takes \(16\) minutes for it's \(50\%\) completion. What fraction that would react in \(32\) minutes from the beginning?

In first order reaction, 20 % concentration remains after 10 min. What would be the rate constant of reaction if \(log_{10}(5) = 0.6989\)?

The half life of first order reaction is \(850\) s. The initial concentration of the reactant is \(0.06\) mol \(\text{dm}^{-3}\). What concentration would remain after \(1200\) s ?

A first order reaction complete \(60\)% in \(20\) minutes. How long will the reaction take to complete \(84\)%?

Which of the following statements is NOT true about the rate constant?

The rate constant for a first order reaction is \(60\text{ s}^{-1}\). How much time will it take to reduce the concentration of the reactant to \(1/20^{\text{th}}\) of its initial value?