(D) For a first order reaction,the rate constant $K$ is given by $K = \frac{0.693}{t_{1/2}}$.Thus,the unit of $K$ is $Time^{-1}$ (e.g.,$s^{-1}$ or $mi

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The unit of $K$ is $mole^{-1} \ min^{-1}$.

(D) For a first order reaction,the rate constant $K$ is given by $K = \frac{0.693}{t_{1/2}}$.Thus,the unit of $K$ is $Time^{-1}$ (e.g.,$s^{-1}$ or $min^{-1}$).Option $(d)$ states the unit is $mole^{-1} \ min^{-1}$,which is the unit for a second order reaction.Therefore,statement $(d)$ is incorrect.

Class 12 Chemistry Chemical Kinetics First Order reaction

Easy

Point out the wrong statement for a first order reaction:

A
Time for half-change $({t_{1/2}})$ is independent of initial concentration.
B
Change in the concentration unit does not change the rate constant $(K)$.
C
Time for half-change $\times$ rate constant $= 0.693$.
D
The unit of $K$ is $mole^{-1} \ min^{-1}$.

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Chemical Kinetics

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First Order reaction

At $500\,^oC$,cyclopropane isomerizes to propene. This reaction is first order with a rate constant of $6.7 \times 10^{-4}\,s^{-1}$. If the initial concentration of cyclopropane is $0.05\, M$,what will be the molarity of cyclopropane after $30\, min$ (in $, M$)?

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For the reaction ${N_2}{O_{5(g)}} \to 2N{O_{2(g)}} + \frac{1}{2}{O_{2(g)}}$,the rate constant is $2.3 \times 10^{-2} \ s^{-1}$. Which of the following equations represents the variation of $[{N_2}{O_5}]$ with time?

Medium

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For a first order reaction $A \to$ product,the rate of reaction at $[A] = 0.2 \, mol \, L^{-1}$ is $1.0 \times 10^{-2} \, mol \, L^{-1} \, min^{-1}$. The half-life period for the reaction is .......... $min$.

Medium

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$A$ first order reaction has a rate constant $0.00813 \ min^{-1}$. How long will it take for $60 \%$ completion (in $min$)?

EasyMHT CET 2020

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Time required for $99.9 \%$ completion of a first order reaction is . . . . . . . times the time required for completion of $90 \%$ reaction. (nearest integer).

MediumJEE MAIN 2024

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Point out the wrong statement for a first order reaction:

Similar Questions

At $500\,^oC$,cyclopropane isomerizes to propene. This reaction is first order with a rate constant of $6.7 \times 10^{-4}\,s^{-1}$. If the initial concentration of cyclopropane is $0.05\, M$,what will be the molarity of cyclopropane after $30\, min$ (in $, M$)?

For the reaction ${N_2}{O_{5(g)}} \to 2N{O_{2(g)}} + \frac{1}{2}{O_{2(g)}}$,the rate constant is $2.3 \times 10^{-2} \ s^{-1}$. Which of the following equations represents the variation of $[{N_2}{O_5}]$ with time?

For a first order reaction $A \to$ product,the rate of reaction at $[A] = 0.2 \, mol \, L^{-1}$ is $1.0 \times 10^{-2} \, mol \, L^{-1} \, min^{-1}$. The half-life period for the reaction is .......... $min$.

$A$ first order reaction has a rate constant $0.00813 \ min^{-1}$. How long will it take for $60 \%$ completion (in $min$)?

Time required for $99.9 \%$ completion of a first order reaction is . . . . . . . times the time required for completion of $90 \%$ reaction. (nearest integer).

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