Chemical Kinetics PYQs - Last 5 Years
MHT CET / Chemistry / Physical Chemistry / 177 recent questions
ChemistryPhysical Chemistry2022-2026
Practice 177 MHT CET Chemistry questions from Chemical Kinetics. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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Last 5 Years Chemical Kinetics Questions
Showing 50 of 177 filtered questions.
1Chemical Kinetics
What is the half life of a first order reaction if time required to decrease concentration of reactant from 0.8 M to 0.2 M is 12 hour?
MCQ+1 / -02024
2Chemical Kinetics
What is the order of following reaction
\(2 \mathrm{H}_2 \mathrm{O}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}+\mathrm{O}_{2(\mathrm{~g})}\)
\(2 \mathrm{H}_2 \mathrm{O}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{l})}+\mathrm{O}_{2(\mathrm{~g})}\)
MCQ+1 / -02024
3Chemical Kinetics
For the reaction $2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \longrightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}$ rate and rate constant are $1.02 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$ and $...
MCQ+1 / -02024
4Chemical Kinetics
For a reaction, \(2 \mathrm{~N}_2 \mathrm{O}_{5(\mathrm{~g})} \longrightarrow 4 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{O}_{2(\mathrm{~g})}\)
$\mathrm{N}_2 \mathrm{O}_5$ disappears at a rate of $0.06 \mathrm{~mol~dm}^{-3} \mathrm{~s}^{-1}$ Wha...
$\mathrm{N}_2 \mathrm{O}_5$ disappears at a rate of $0.06 \mathrm{~mol~dm}^{-3} \mathrm{~s}^{-1}$ Wha...
MCQ+1 / -02024
5Chemical Kinetics
Which of the following statements is correct about zero order reaction?
MCQ+1 / -02024
6Chemical Kinetics
What time is required for 100 g of reactant to reduce to 25 g in a first order reaction having half life 5760 year?
MCQ+1 / -02024
7Chemical Kinetics
For a zero order reaction $\mathrm{A} \longrightarrow$ product. Conc. of $A$ decreases from $0.8 \mathrm{~mol} \mathrm{~dm}^{-3}$ to $0.2 \mathrm{~mol} \mathrm{~dm}^{-3}$ in 6 minute. What is rate constant of the reaction?
MCQ+1 / -02024
8Chemical Kinetics
What is rate constant of a first order reaction if $60 \%$ reactant decompose in 45 minute?
MCQ+1 / -02024
9Chemical Kinetics
Half life of a zero order reaction is directly proportional to ___________
MCQ+1 / -02024
10Chemical Kinetics
Calculate the time required for reactant to decrease the concentration from $100 \%$ to $20 \%$, if rate constant of first order reaction is 0.02303 hours $^{-1}$.
MCQ+1 / -02024
11Chemical Kinetics
Rate law for the reaction $2 \mathrm{NO}+\mathrm{Cl}_2 \rightarrow 2 \mathrm{NOCl}$ is rate $=\mathrm{k}[\mathrm{NO}]^2\left[\mathrm{Cl}_2\right]$. When will the value of k increase?
MCQ+1 / -02024
12Chemical Kinetics
What is the rate of formation of $\mathrm{O}_2$ for the reaction stated below?
$$\begin{aligned}
& 2 \mathrm{~N}_2 \mathrm{O}_{5(8)} \longrightarrow 4 \mathrm{NO}_{2(g)}+\mathrm{O}_{2(\mathrm{~g})} \\
& {\left[\frac{\mathrm{d}\left[\mathrm{...
$$\begin{aligned}
& 2 \mathrm{~N}_2 \mathrm{O}_{5(8)} \longrightarrow 4 \mathrm{NO}_{2(g)}+\mathrm{O}_{2(\mathrm{~g})} \\
& {\left[\frac{\mathrm{d}\left[\mathrm{...
MCQ+1 / -02024
13Chemical Kinetics
What is the value of slope, if $\log _{10} \mathrm{~K}$ (y-axis) is plotted versus $1 / \mathrm{T}$ ( $x$-axis) for Arrhenius equation?
MCQ+1 / -02024
14Chemical Kinetics
In a first order reaction if concentartion of reactant drops from $0.8 \mathrm{~mol} \mathrm{~L}^{-1}$ to $0.4 \mathrm{~mol} \mathrm{~L}^{-1}$ in 15 minute. What is the time required to drop concentration from $0.1 \mathrm{~mol} \mathrm{~L}...
MCQ+1 / -02024
15Chemical Kinetics
For the reaction, $A+3 B \longrightarrow 2 C$
rate of consumption of A is $1.4 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~sec}^{-1}$. Calculate rate of formation of C ?
rate of consumption of A is $1.4 \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~sec}^{-1}$. Calculate rate of formation of C ?
MCQ+1 / -02024
16Chemical Kinetics
Which of the following is true for a reaction as per coliision theory?
MCQ+1 / -02024
17Chemical Kinetics
A zero order reaction has half life time of 0.2 minute. If initial concentration of reactant is $0.2 \mathrm{~mol} \mathrm{dm}^{-3}$. Find rate constant.
MCQ+1 / -02024
18Chemical Kinetics
Rate of reaction, $\mathrm{A}+\mathrm{B} \rightarrow$ product, is $7.2 \times 10^{-2} \mathrm{moldm}^{-3} \mathrm{~s}^{-1}$ at $[\mathrm{A}]=0.4 \mathrm{~mol} \mathrm{dm}^{-3}$ and $[B]=0.1 \mathrm{~mol} \mathrm{dm}^{-3}$. The reaction is f...
MCQ+1 / -02024
19Chemical Kinetics
For the reaction,
\(\mathrm{H}_{2(g)}+\mathrm{Br}_{2(8)} \longrightarrow 2 \mathrm{HBr}_{(\mathrm{g})}, \mathrm{r}=\mathrm{k}\left[\mathrm{H}_2\right]\left[\mathrm{Br}_2\right]^{\frac{1}{2}}\)
What is the molecularity and order of reaction ...
\(\mathrm{H}_{2(g)}+\mathrm{Br}_{2(8)} \longrightarrow 2 \mathrm{HBr}_{(\mathrm{g})}, \mathrm{r}=\mathrm{k}\left[\mathrm{H}_2\right]\left[\mathrm{Br}_2\right]^{\frac{1}{2}}\)
What is the molecularity and order of reaction ...
MCQ+1 / -02024
20Chemical Kinetics
For the reaction,
\(\mathrm{CH}_3 \mathrm{Br}_{(\mathrm{aq})}+\mathrm{OH}_{(\mathrm{aq})}^{-} \longrightarrow \mathrm{CH}_3 \mathrm{OH}_{(\mathrm{aq})}+\mathrm{Br}_{(\mathrm{aq})}^{-}\)
rate of consumption of $\mathrm{OH}_{(\mathrm{aq})}^{...
\(\mathrm{CH}_3 \mathrm{Br}_{(\mathrm{aq})}+\mathrm{OH}_{(\mathrm{aq})}^{-} \longrightarrow \mathrm{CH}_3 \mathrm{OH}_{(\mathrm{aq})}+\mathrm{Br}_{(\mathrm{aq})}^{-}\)
rate of consumption of $\mathrm{OH}_{(\mathrm{aq})}^{...
MCQ+1 / -02024
21Chemical Kinetics
In a first order reaction $60 \%$ of the reactant converts into product in 45 minute. Calculate rate constant of the reaction.
MCQ+1 / -02024
22Chemical Kinetics
For the reaction
$$\begin{aligned}
& 2 \mathrm{NO}_{(\mathrm{s})}+2 \mathrm{H}_{2(\mathrm{~g})} \longrightarrow \mathrm{N}_{2(\mathrm{~g})}+2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{s})} \\\\
& \text { rate }=\mathrm{k}[\mathrm{NO}]^2\left[\mathr...
$$\begin{aligned}
& 2 \mathrm{NO}_{(\mathrm{s})}+2 \mathrm{H}_{2(\mathrm{~g})} \longrightarrow \mathrm{N}_{2(\mathrm{~g})}+2 \mathrm{H}_2 \mathrm{O}_{(\mathrm{s})} \\\\
& \text { rate }=\mathrm{k}[\mathrm{NO}]^2\left[\mathr...
MCQ+1 / -02024
23Chemical Kinetics
A first order reaction takes 40 minute for $20 \%$ decomposition. Calculate its rate constant.
MCQ+1 / -02024
24Chemical Kinetics
Which among the following statements is NOT true about rate constant?
MCQ+1 / -02024
25Chemical Kinetics
For reaction $\mathrm{A}+\mathrm{B} \rightarrow$ product, rate of reaction is $3.6 \times 10^{-2} \mathrm{sec}^{-1}$. When $[\mathrm{A}]=0.2 \mathrm{moldm}^{-3}$ and $[B]=0.1 \mathrm{moldm}^{-3}$, calculate rate constant of reaction if reac...
MCQ+1 / -02024
26Chemical Kinetics
For a reaction $\mathrm{r}=\mathrm{k}[\mathrm{A}][\mathrm{B}]^2$, if concentration of $A$ is doubled the rate of reaction
MCQ+1 / -02024
27Chemical Kinetics
The reaction given below $2 \mathrm{NH}_{3(\mathrm{g})} \xrightarrow{\mathrm{Pt}} \mathrm{N}_{2(\mathrm{g})}+3 \mathrm{H}_{2(\mathrm{g})}$ has rate of reaction $2.5 \times 10^{-6} \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{sec}^{-1}$ formation ...
MCQ+1 / -02024
28Chemical Kinetics
Which of the following is an elementary reaction?
MCQ+1 / -02024
29Chemical Kinetics
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.
\(2 \mathrm{NO}_2 \mathrm{Cl}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{NO}_{2(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})}\)
is 4.7672 minute $^{-1}$. Calculate half life of reaction.
MCQ+1 / -02024
30Chemical Kinetics
Initial concentration of reactant in a first order reaction is $0.08 \mathrm{~mol} \mathrm{~dm}^{-3}$ What concentration would remain after 40 minute?
\(\left(\text { given } \frac{[\mathrm{A}]_0}{[\mathrm{~A}]_{\mathrm{t}}}=5.00\right)\)
\(\left(\text { given } \frac{[\mathrm{A}]_0}{[\mathrm{~A}]_{\mathrm{t}}}=5.00\right)\)
MCQ+1 / -02024
31Chemical Kinetics
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?
MCQ+1 / -02024
32Chemical Kinetics
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} \m...
MCQ+1 / -02024
33Chemical Kinetics
If instantaneous rate of reaction is given as
$$
-\frac{1}{\mathrm{a}} \frac{\mathrm{~d}[\mathrm{~A}]}{\mathrm{dt}}=-\frac{1}{\mathrm{~b}} \frac{\mathrm{~d}[\mathrm{~B}]}{\mathrm{dt}}=\frac{1 \mathrm{~d}[\mathrm{C}]}{\mathrm{c}]}=\frac{1 \...
$$
-\frac{1}{\mathrm{a}} \frac{\mathrm{~d}[\mathrm{~A}]}{\mathrm{dt}}=-\frac{1}{\mathrm{~b}} \frac{\mathrm{~d}[\mathrm{~B}]}{\mathrm{dt}}=\frac{1 \mathrm{~d}[\mathrm{C}]}{\mathrm{c}]}=\frac{1 \...
MCQ+1 / -02024
34Chemical Kinetics
For a zero order reaction, $\mathrm{A} \longrightarrow$ product, concentration of A decreases from $1.2 \mathrm{~mol~dm}^{-3}$ to $0.4 \mathrm{~mol~dm}^{-3}$ in 240 second. What is rate constant of the reaction?
MCQ+1 / -02024
35Chemical Kinetics
Calculate rate constant of first order reaction if concentration of reactant decreases by $90 \%$ in 30 minute?
MCQ+1 / -02024
36Chemical Kinetics
Which of the following is NOT true about order of a reaction?
MCQ+1 / -02024
37Chemical Kinetics
Which from following decides the rate of multistep reaction?
MCQ+1 / -02024
38Chemical Kinetics
Rate of a first order reaction is $1.5 \times 10^{-2} \mathrm{~mol} \mathrm{~L}^{-1}$ minute ${ }^{-1}$ at 0.5 M concentration of reactant, calculate half life of reaction.
MCQ+1 / -02024
39Chemical Kinetics
For the reaction $\mathrm{A}+\mathrm{B} \longrightarrow$ product, rate law equation is, rate $=k[A]^2[B]$. If rate of reaction is $0.22 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$, calculate rate constant. ($\mathrm{[A}]=1 \mathrm{~mol...
MCQ+1 / -02024
40Chemical Kinetics
The rate for reaction \(\mathrm{A}+\mathrm{B} \rightarrow\) product, is \(1.8 \times 10^{-2} \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}\). Calculate the rate constant if the reaction is second order in \(\mathrm{A}\) and first order i...
MCQ+1 / -02023
41Chemical Kinetics
Calculate the amount of reactant in percent that remains after 60 minutes involved in first order reaction. \(\left(\mathrm{k}=0.02303\right.\) minute \(\left.^{-1}\right)\)
MCQ+1 / -02023
42Chemical Kinetics
Which from following is the slope of the graph of rate versus concentration of the reactant for first order reaction?
MCQ+1 / -02023
43Chemical Kinetics
Find the average rate of formation \(\mathrm{O}_{2(\mathrm{~g})}\) in the following reaction.
$$\begin{aligned}
& 2 \mathrm{NO}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{NO}_{(\mathrm{g})}+\mathrm{O}_{2(\mathrm{~g})} \\
& {\left[-\frac{\Delta[...
$$\begin{aligned}
& 2 \mathrm{NO}_{2(\mathrm{~g})} \rightarrow 2 \mathrm{NO}_{(\mathrm{g})}+\mathrm{O}_{2(\mathrm{~g})} \\
& {\left[-\frac{\Delta[...
MCQ+1 / -02023
44Chemical Kinetics
The rate law for the reaction \(\mathrm{A}+\mathrm{B} \rightarrow\) product is given by rate \(=k[A][B]\) Calculate \([A]\) if rate of reaction and rate constant are \(0.25 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{~s}^{-1}\) and $$6.25 \mathr...
MCQ+1 / -02023
45Chemical Kinetics
Calculate the rate constant of first order reaction if the concentration of the reactant decreases by \(90 \%\) in 30 minutes.
MCQ+1 / -02023
46Chemical Kinetics
Calculate half life of first order reaction if rate constant of reaction is \(2.772 \times 10^{-3} \mathrm{~s}^{-1}\)
MCQ+1 / -02023
47Chemical Kinetics
The rate for reaction \(2 \mathrm{~A}+\mathrm{B} \rightarrow\) product is \(6 \times 10^{-4} \mathrm{~mol} \mathrm{~dm}^{-3} \mathrm{~s}^{-1}\) Calculate the rate constant if the reaction is first order in \(\mathrm{A}\) and zeroth order in...
MCQ+1 / -02023
48Chemical Kinetics
Find the rate law for the reaction, \(\mathrm{CHCl}_{3(\mathrm{~g})}+\mathrm{Cl}_{2(\mathrm{~g})} \rightarrow \mathrm{CCl}_{4(\mathrm{~g})}+\mathrm{HCl}_{(\mathrm{g})}\) if order of reaction with respect to $$\mathrm{CHCl}_{\mathrm{a}(\math...
MCQ+1 / -02023
49Chemical Kinetics
The rate law for the reaction \(\mathrm{A}+\mathrm{B} \rightarrow\) product is rate \(=\mathrm{k}[\mathrm{A}][\mathrm{B}]\). When will the rate of reaction increase by factor two?
MCQ+1 / -02023
50Chemical Kinetics
What is the value of rate constant for first order reaction if slope for the graph of rate versus concentration is \(2.5 \times 10^{-3}\) ?
MCQ+1 / -02023