List of top Chemistry Questions on Chemical Kinetics asked in KCET

For the reaction \( \text{2N}_2\text{O}_5 \rightarrow 4\text{NO}_2 (g) + \text{O}_2 (g) \), the initial concentration of \( \text{N}_2\text{O}_5 \) is 2.0 mol L\(^{-1}\), and after 300 minutes, it is reduced to 1.4 mol L\(^{-1}\). The rate of production of \( \text{NO}_2 \) (in mol L\(^{-1}\) min\(^{-1}\)) is

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

For a reaction, the value of rate constant at 300 K is 6.0 ×10⁵ s^-1. The value of Arrhenius factor A at infinitely high temperature is :

The rate constants k₁ and k₂ for two different reactions are 10¹⁶ × e^-2000/T and 10¹⁵ × e^-1000/T respectively. The temperature at which k₁ = k₂ is :

Half- life of a reaction is found to the 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

The rate of reaction:
\(\text{CH}_3\text{COOC}_2\text{H}_5 + \text{NaOH} \rightarrow \text{CH}_3\text{COONa} + \text{C}_2\text{H}_5\text{OH}\)
is given by the equation. Rate \(K[\text{CH}_2\text{COOC}_2\text{H}_5] [\text{NaOH}]\). If concentration is expressed in \(\text{mol L}^{-1}\). The unit of K is

A first order reaction is half completed in 45 min. How long does it need 99.9% of the reaction to be completed?

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

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

For a reaction A + 2B → 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

The rate constant of a reaction is given by $k=P Ze^{-Ea/RT}$ under standard notation. In order to speed up the reaction, which of the following factors has to be decreased ?

The time required for $60\%$ completion of a first order reaction is $50$ min. The time required for $93.6\%$ completion of the same reaction will be

1 L of 2 M CH3COOH is mixed with 1 L of 3M C2H5OH to form an ester. The rate of the reaction with respect to the initial rate when each solution is diluted with an equal volume of water will be

For the reaction, $2SO_2 + O_2 <=> 2SO_3, $ the rate of disappearance of $O_2$ is $2 \times 10^{-4} \, mol \, L^{-1} \, s^{-1}$ . The rate of of appearance of $SO_3$ is

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

The half-life period of a order reaction is 60 minutes What percentage will be left over after 240 minutes ?

Half-life period of a first order reaction is $10\, min$. Starting with initial concentration $12\, M$, the rate after $20\, min$ is

In a first order reaction, the concentration of the reactant is reduced to $12.5\%$ in one hour. When was it half completed ?

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

The following data is obtained during the first order thermal decomposition of $2A_{(g)} \rightarrow B_{(g)} + C_{(s)}$, at constant volume and temperature The rate constant in $min^{-1}$ is

The rate equation for a reaction : $A \rightarrow B$ is $r = K[A]^\circ$. If the initial concentration of the reactant is a mol $dm^{-3}$, the half life period of the reaction is

Which one of the following is a second order reaction ?

A radioactive isotope has a half life of $10$ days. If today $125$ mg is left over, what was its original weight $40$ days earlier ?