MHT CET 2024 11th May Evening Shift | Chemical Kinetics Question 11 | Chemistry

Rate law for a reaction is $r=k[A]^2[B]$. If rate constant is $6.25 \mathrm{~mol}^{-2} \mathrm{dm}^6 \mathrm{~s}^{-1}$, what is the rate of reaction when $[\mathrm{A}]=1 \mathrm{~mol} \mathrm{dm}^{-3}$ and $[\mathrm{B}]=0.2 \mathrm{~mol} \mathrm{dm}^{-3}$ ?

$1.250 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{sec}^{-1}$

$2.125 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{sec}^{-1}$

$3.105 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{sec}^{-1}$

$2.0 \times 10^{-2} \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{sec}^{-1}$

MHT CET 2024 11th May Evening Shift

MCQ (Single Correct Answer)

-0

What is the time needed to reduce the initial concentration of reactant to $10 \%$ in a first order reaction if its half life time is 10 minutes?

15 minute

20 minute

25 minute

33 minute

MHT CET 2024 11th May Morning Shift

MCQ (Single Correct Answer)

-0

Which of the following is an elementary reaction?

$\mathrm{C}_2 \mathrm{H}_5 \mathrm{I}_{(\mathrm{g})} \longrightarrow \mathrm{C}_2 \mathrm{H}_{4(\mathrm{~g})}+\mathrm{HI}_{(\mathrm{g})}$

$2 \mathrm{NO}_2 \mathrm{Cl}_{(\mathrm{g})} \longrightarrow 2 \mathrm{NO}_{2(\mathrm{z})}+\mathrm{Cl}_{2(\mathrm{z})}$

$2 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{F}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{NO}_2 \mathrm{~F}_{(\mathrm{g})}$

$ 2 \mathrm{NO}_{(\mathrm{g})}+\mathrm{Cl}_{2(\mathrm{g})} \longrightarrow 2 \mathrm{NaCl}_{(\mathrm{g})}$

MHT CET 2024 11th May Morning Shift

MCQ (Single Correct Answer)

-0

Rate constant of a reaction, $$ 2 \mathrm{NO}_2 \mathrm{Cl}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})}$$

is 4.7672 minute $^{-1}$. Calculate half life of reaction.

0.0727 minute

0.1454 minute

0.2181 minute

0.4362 minute

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