# Chemical Kinetics · Chemistry · COMEDK

Start Practice## MCQ (Single Correct Answer)

COMEDK 2024 Evening Shift

For a given reaction, ,$$\mathrm{X}(\mathrm{g})+\mathrm{Y}(\mathrm{g} \rightarrow \mathrm{Z}(\mathrm{g})$$, the order of reaction with respect to $$\m...

COMEDK 2024 Evening Shift

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

COMEDK 2024 Evening Shift

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 \m...

COMEDK 2024 Evening Shift

The following data was recorded for the decomposition of XY compound at 750K
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COMEDK 2024 Evening Shift

The Activation energy for the reaction $$A \rightarrow B+C$$, at a temperature $$\mathrm{TK}$$ was $$0.04606 \mathrm{~RT} \mathrm{~J} / \mathrm{mol}$$...

COMEDK 2024 Morning Shift

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 "$$y$$"?...

COMEDK 2024 Morning Shift

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 ...

COMEDK 2024 Morning Shift

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

COMEDK 2024 Morning Shift

Given below are 4 graphs [A], [B], [C] and [D]
Identify the 2 graphs that represent a Zero order reaction?...

COMEDK 2024 Morning Shift

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 react...

COMEDK 2023 Morning Shift

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

COMEDK 2023 Morning Shift

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 \mat...

COMEDK 2023 Morning Shift

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

COMEDK 2023 Evening Shift

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

COMEDK 2023 Evening Shift

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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COMEDK 2023 Evening Shift

Match the details given in Column I with those given in Column II
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COMEDK 2023 Evening Shift

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

COMEDK 2023 Evening Shift

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...

COMEDK 2022

A newly prepared radioactive nuclide has a decay constant of 6.93 s$$^{-1}$$. What is the half-life of the nuclide?

COMEDK 2022

Which of the following statement is incorrect about activation energy?

COMEDK 2022

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$...

COMEDK 2021

Determine the specific rate constant of the reaction. If the half-life period of a first order reaction is 1402 s.

COMEDK 2021

Rate constant (K) of a reaction has least value at

COMEDK 2021

For the reaction 2N$$_2$$O$$_5$$ $$\to$$ 4NO$$_2$$ + O$$_2$$, rate constant $$k$$ is 4.48 $$\times$$ 10$$^{-5}$$ s$$^{-1}$$ and the initial pressure i...

COMEDK 2020

Which one of the following is a second order
reaction?