List of top Chemistry Questions on Chemical Kinetics asked in KEAM

Which of the following statement is incorrect?

Which are complex reaction
(i) Oxidation of ethane
(ii) Thermal decomposition of HI on gold surface
(iii) Saponification of methyl acetate
(iv) Nitration of phenol
(v) Decomposition of $ \text{NH}_3 $ on hot Pt surface

Relationship between $ t_{90} $ and $ t_{99} $ for a first order reaction:

Given the following concentrations and rates, which one corresponds to the rate law for the reaction? \[ [A] = 0.10 \quad [D] = 0.2 \quad \text{Rate} = 0.2 \] \[ [A] = 0.2 \quad [D] = 0.2 \quad \text{Rate} = 0.4 \] \[ [A] = 0.10 \quad [D] = 0.1 \quad \text{Rate} = 0.05 \]

A first-order reaction is 75 percent completed in 6000s. What is the half-life?

Find the half-life of a first order reaction if $ K = 2.31 \times 10^5 \, \text{s}^{-1} $.

Which of the following is an example of pseudo first order reaction?

The following results were obtained in the gas phase reaction between nitric oxide and oxygen at a given temperature.

Find the correct combination about the following plots (P,Q and R) for the variation rate of reaction with time.

In a zero-order reaction,the reactant A disappeared with a rate of reaction k=0.04 Msec^-1. The initial concentration of A is 1 M. What will be the concentration of A after 20 seconds?

In a reaction 3A → Products, the concentration of A decreases from 0.4molL^-1 to 0.1molL^-1 in 20 minutes at 300K. The rate of decrease in [A] during this interval (in molL^-1min^-1) at 300K is

Which one of the following processes does not produce dinitrogen?

The half-life period of a first order reaction at 298K is 20 minutes. The time (in min.) required for 99.9% completion of the reaction at the same temperature, is

The rate constant of the reaction $2N_2O_5 \rightarrow 4NO_2 + O_2$ at $300\,K$ is $3 \times 10^{-5}\,s^{-1}$. If the rate of the reaction at the same temperature is $2.4 \times 10^{-5}\, mol\, dm^{-3}\, s^{-1}$, then the molar concentration of $N_2O_5$ is

Ammonium ion $\left( NH _{4}^{+}\right)$ reacts with nitrite ion $\left( NO _{2}^{-}\right)$ in aqueous solution according to the equation $NH _{4}^{+}(a q)+ NO _{2}^{-}(a q) \longrightarrow N _{2}(g)+2 H _{2} O (l)$ The following initial rates of reaction have been measured for the given reactant concentrations. Which of the following is the rate law for this reaction?

In a reaction, $2A \rightarrow$ products the concentration of A decreases from $0.50 \,M$ to $0.38 \,M$ in $10 \,min$. What is the rate of the reaction (in $Ms^{-1}$) during this interval?

In a first order reaction 80% of the reactant at an instant was reduced to 8% in 4606 seconds. The rate constant of the reaction is

In a first order reaction, the concentration of reactant is reduced to $1/8$ of the initial concentration in $75$ minutes at $298 \,K$. What is the half-life period of the reaction in minutes?

For a first order reaction the rate constant is 6.909 $min^{-1}$. The time taken for 75% conversion in minutes is

At $ 500 \,K $ , the half-life period of a gaseous reaction at an initial pressure of $ 80\, kPa $ is $ 350 \,s $ . When the pressure is $ 40 \,kPa $ , the half-life period is $ 175 \,s $ . The order of the reaction is

For a first order reaction, $A(g) \rightarrow B(g)$ at $35^{\circ} C$, the volume of $A$ left in reaction vessel at various times are given below. [Given data : $\log (5 / 4)=0.096$. What is the value of rate constant?

For a first order reaction, the time taken to reduce the initial concentration by a factor of 1/4 is 20 min. The time required to reduce initial concentration by a factor of 1/16 is

For a zero order reaction, the plot of concentration of reactant $vs$ time is (intercept refers to concentration axis)

Half-lives of a first order and a zero order reactions are same. Then, the ratio of the initial rates of first order reaction to that of the zero order reaction is

In a reaction $2 A+B \longrightarrow 3 C$, the concentration of $A$ decreases from $0.5\, mol \,L \,^{-1}$ to $0.3\, mol\, L^{-1}$ in $10$ minutes. The rate of production of $C$ during this period is