Chemical Kinetics and Nuclear Chemistry PYQs - Last 10 Years
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Practice 184 JEE Main Chemistry questions from Chemical Kinetics and Nuclear Chemistry. Use the year-wise and type-wise breakdown to prioritize recent PYQs, then continue into the question list below.
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Last 10 Years Chemical Kinetics and Nuclear Chemistry Questions
Showing 50 of 184 filtered questions.
1Chemical Kinetics And Nuclear Chemistry
Given below are two statements :
\(\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} \text { and } 1 \mathrm{cal}=4.2 \mathrm{~J}\)
Statement I : When $\mathrm{Ea}=12.6 \mathrm{kcal} / \mathrm{mol}$, the room temperature ra...
\(\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} \text { and } 1 \mathrm{cal}=4.2 \mathrm{~J}\)
Statement I : When $\mathrm{Ea}=12.6 \mathrm{kcal} / \mathrm{mol}$, the room temperature ra...
MCQ+4 / -12026
2Chemical Kinetics And Nuclear Chemistry
Sucrose hydrolyses in acidic medium into glucose and fructose by first order rate law with $t_{1 / 2}=3$ hour. The percentage of sucrose remaining after 6 hours is
$\_\_\_\_$ . (Nearest integer)
(Given $: \log 2=0.3010$ and $\log 3=0.4771$ ...
$\_\_\_\_$ . (Nearest integer)
(Given $: \log 2=0.3010$ and $\log 3=0.4771$ ...
INTEGER+4 / -12026
3Chemical Kinetics And Nuclear Chemistry
Decomposition of a hydrocarbon follows the equation $\mathrm{k}=\left(5.5 \times 10^{11} \mathrm{~s}^{-1}\right) \mathrm{e}^{\frac{-28000 \mathrm{~K}}{\mathrm{~T}}}$. The activation energy of reaction is $\_\_\_\_$ $\mathrm{kJ} \mathrm{mol}...
INTEGER+4 / -12026
4Chemical Kinetics And Nuclear Chemistry
First order gas phase reaction
\(\mathrm{A} \rightarrow \mathrm{~B}+\mathrm{C}\)
$p_t=$ initial pressure of gas $\mathrm{A}, p_t=$ total pressure of the reaction mixture at time $t$
Expression of rate constant ( $k$ ) is
\(\mathrm{A} \rightarrow \mathrm{~B}+\mathrm{C}\)
$p_t=$ initial pressure of gas $\mathrm{A}, p_t=$ total pressure of the reaction mixture at time $t$
Expression of rate constant ( $k$ ) is
MCQ+4 / -12026
5Chemical Kinetics And Nuclear Chemistry
If the half life of a first order reaction is 6.93 minutes then the time required for completion of $99 \%$ of the reaction will be $\_\_\_\_$ minutes.
(Given $: \log 2=0.3010$ )
(Given $: \log 2=0.3010$ )
INTEGER+4 / -12026
6Chemical Kinetics And Nuclear Chemistry
For a reaction $\mathrm{A} \rightarrow \mathrm{P}$ at T K , the half life $\left(\mathrm{t}_{1 / 2}\right)$ is plotted as a function of initial concentration $[\mathrm{A}]_0$ of A as given below.
The value of $x$ in the given figure is $\_\...
The value of $x$ in the given figure is $\_\...
INTEGER+4 / -12026
7Chemical Kinetics And Nuclear Chemistry
Consider the first order reaction $\mathrm{R} \rightarrow \mathrm{P}$.
The fraction of molecules decomposed in the given first order reaction can be expressed as
The fraction of molecules decomposed in the given first order reaction can be expressed as
MCQ+4 / -12026
8Chemical Kinetics And Nuclear Chemistry
\(\text { For a first order reaction } \mathrm{A} \rightarrow \mathrm{~B}\)
$$ \begin{array}{|l|l|} \hline \mathrm{t} / \min & {[\mathrm{A}] / \mathrm{M}} \\ \hline 0 & 0.6500 \\ \hline x & 0.0650 \\ \hline 20 & 0.00065 \\ \hline \end{arr...
$$ \begin{array}{|l|l|} \hline \mathrm{t} / \min & {[\mathrm{A}] / \mathrm{M}} \\ \hline 0 & 0.6500 \\ \hline x & 0.0650 \\ \hline 20 & 0.00065 \\ \hline \end{arr...
INTEGER+4 / -12026
9Chemical Kinetics And Nuclear Chemistry
Consider the given graph showing variation of reactant concentration with time.
Three different reactions were started with identical initial concentration of reactants. Which of the following statement is correct?
Three different reactions were started with identical initial concentration of reactants. Which of the following statement is correct?
MCQ+4 / -12026
10Chemical Kinetics And Nuclear Chemistry
For reaction A → P, rate constant $k = 1.5 \times 10^3 \ \mathrm{s}^{-1}$ at $27^{\circ}\mathrm{C}$If activation energy for the above reaction is $60\ \mathrm{kJ}\ \mathrm{mol}^{-1}$, then the temperature (in $^{\circ}\mathrm{C}$) at which ...
INTEGER+4 / -12026
11Chemical Kinetics And Nuclear Chemistry
t100% is the time required for the 100% completion of the reaction while t1/2 is the time required for 50% of the reaction to be completed. Which of the following option correctly represents the relation between t100% and t1/2 for zero and ...
MCQ+4 / -12026
12Chemical Kinetics And Nuclear Chemistry
Consider the following gas phase reaction being carried out in a closed vessel at $25 ^\circ$C.\(2A(g) \longrightarrow 4B(g) + C(g)\)table {width: 100%;border-collapse: collapse;margin: 20px 0;}th {background-color: blue;color: white;border...
INTEGER+4 / -12026
13Chemical Kinetics And Nuclear Chemistry
Consider the reaction aX → bY, for which the rate constant at 30°C is $1 \times 10^{-3}\ \text{mol}^{-1}\ \text{L}\ \text{s}^{-1}$. Which of the following statements are true?
A. When concentration of ‘X’ is increased to four times, the rat...
A. When concentration of ‘X’ is increased to four times, the rat...
MCQ+4 / -12026
14Chemical Kinetics And Nuclear Chemistry
An organic compound undergoes first order decomposition. The time taken for decomposition to $\left(\frac{1}{8}\right)^{\text {th }}$ and $\left(\frac{1}{10}\right)^{\text {th }}$ of its initial concentration are $\mathrm{t}_{1 / 8}$ and $\...
MCQ+4 / -12026
15Chemical Kinetics And Nuclear Chemistry
A → B (first reaction)C → D (second reaction)Consider the above two first-order reactions. The rate constant for first reaction at 500 K is double of the same at 300 K. At 500 K, 50% of the reaction becomes complete in 2 hour. The activatio...
INTEGER+4 / -12026
16Chemical Kinetics And Nuclear Chemistry
At $27^{\circ} \mathrm{C}$ in presence of a catalyst, activation energy of a reaction is lowered by $10 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The logarithm of ratio of $\frac{\mathrm{k} \text { (catalysed) }}{\mathrm{k} \text { (uncatalysed) }}...
MCQ+4 / -12026
17Chemical Kinetics And Nuclear Chemistry
$\mathrm{A} \rightarrow \mathrm{D}$ is an endothermic reaction occurring in three steps (elementary).
(i) $\mathrm{A} \rightarrow \mathrm{B} \Delta \mathrm{H}_i=+\mathrm{ve}$
(ii) $\mathrm{B} \rightarrow \mathrm{C} \Delta \mathrm{H}_{i i}=-...
(i) $\mathrm{A} \rightarrow \mathrm{B} \Delta \mathrm{H}_i=+\mathrm{ve}$
(ii) $\mathrm{B} \rightarrow \mathrm{C} \Delta \mathrm{H}_{i i}=-...
MCQ+4 / -12026
18Chemical Kinetics And Nuclear Chemistry
The half-life of ${ }^{65} \mathrm{Zn}$ is 245 days. After $x$ days, $75 \%$ of original activity remained. The value of $x$ in days is $\_\_\_\_$ . (Nearest integer)
(Given: $\log 3=0.4771$ and $\log 2=0.3010$ )
(Given: $\log 3=0.4771$ and $\log 2=0.3010$ )
INTEGER+4 / -12026
19Chemical Kinetics And Nuclear Chemistry
For the thermal decomposition of reactant $\mathrm{AB}(\mathrm{g})$, the following plot is constructed.
The half life of the reaction is ' $x^{\prime} \,\mathrm{min}$.
$x=$ $\_\_\_\_$ min. (Nearest integer)
The half life of the reaction is ' $x^{\prime} \,\mathrm{min}$.
$x=$ $\_\_\_\_$ min. (Nearest integer)
INTEGER+4 / -12026
20Chemical Kinetics And Nuclear Chemistry
Observe the following reactions at $\mathrm{T}(\mathrm{K})$.
I. $\mathrm{A} \rightarrow$ products.
II. $5 \mathrm{Br}^{-}(\mathrm{aq})+\mathrm{BrO}_3{ }^{-}(\mathrm{aq})+6 \mathrm{H}^{+}(\mathrm{aq}) \rightarrow 3 \mathrm{Br}_2(\mathrm{aq})...
I. $\mathrm{A} \rightarrow$ products.
II. $5 \mathrm{Br}^{-}(\mathrm{aq})+\mathrm{BrO}_3{ }^{-}(\mathrm{aq})+6 \mathrm{H}^{+}(\mathrm{aq}) \rightarrow 3 \mathrm{Br}_2(\mathrm{aq})...
MCQ+4 / -12026
21Chemical Kinetics And Nuclear Chemistry
Given above is the concentration vs time plot for a dissociation reaction : $\mathrm{A} \rightarrow \mathrm{nB}$.
Based on the data of the initial phase of the reaction (initial 10 min ), the value of n is $\_\_\_\_$ .
MCQ+4 / -12026
22Chemical Kinetics And Nuclear Chemistry
The temperature at which the rate constants of the given below two gaseous reactions become equal is $\_\_\_\_$ K. (Nearest integer)
$$ \begin{array}{ll} \mathrm{X} \longrightarrow \mathrm{Y}, & \mathrm{k}_1=10^6 e^{\frac{-30000}{\mathrm{~T...
$$ \begin{array}{ll} \mathrm{X} \longrightarrow \mathrm{Y}, & \mathrm{k}_1=10^6 e^{\frac{-30000}{\mathrm{~T...
INTEGER+4 / -12026
23Chemical Kinetics And Nuclear Chemistry
$\mathrm{A} \rightarrow$ product (First order reaction).
Three sets of experiment were performed for a reaction under similar experimental conditions:
Run $1 \Rightarrow 100 \mathrm{~mL}$ of 10 M solution of reactant A
Run $2 \Rightarrow 20...
Three sets of experiment were performed for a reaction under similar experimental conditions:
Run $1 \Rightarrow 100 \mathrm{~mL}$ of 10 M solution of reactant A
Run $2 \Rightarrow 20...
MCQ+4 / -12026
24Chemical Kinetics And Nuclear Chemistry
Consider $\mathrm{A} \xrightarrow{\mathrm{k}_1} \mathrm{~B}$ and $\mathrm{C} \xrightarrow{\mathrm{k}_2} \mathrm{D}$ are two reactions. If the rate constant $\left(\mathrm{k}_1\right)$ of the $\mathrm{A} \longrightarrow \mathrm{B}$ reaction ...
INTEGER+4 / -12026
25Chemical Kinetics And Nuclear Chemistry
Correct statements regarding Arrhenius equation among the following are :
A. Factor $e^{-\mathrm{Ea} / \mathrm{RT}}$ corresponds to fraction of molecules having kinetic energy less than Ea.
B. At a given temperature, lower the Ea, faster is...
A. Factor $e^{-\mathrm{Ea} / \mathrm{RT}}$ corresponds to fraction of molecules having kinetic energy less than Ea.
B. At a given temperature, lower the Ea, faster is...
MCQ+4 / -12026
26Chemical Kinetics And Nuclear Chemistry
Pre-exponential factors of two different reactions of same order are identical. Let activation energy of first reaction exceeds the activation energy of second reaction by $20 \mathrm{~kJ} \mathrm{~mol}^{-1}$. If $\mathrm{k}_1$ and $\mathrm...
INTEGER+4 / -12026
27Chemical Kinetics And Nuclear Chemistry
Decomposition of A is a first order reaction at T(K) and is given by A(g) → B(g) + C(g).In a closed 1 L vessel, 1 bar A(g) is allowed to decompose at T(K). After 100 minutes, the total pressure was 1.5 bar. What is the rate constant (in mi...
MCQ+4 / -12026
28Chemical Kinetics And Nuclear Chemistry
In a first order decomposition reaction, the time taken for the decomposition of reactant to one fourth and one eighth of its initial concentration are $t_1$ and $t_2$ (s), respectively. The ratio $t_1/t_2$ will be:
MCQ+4 / -12025
29Chemical Kinetics And Nuclear Chemistry
Reaction $\mathrm{A}(\mathrm{g}) \rightarrow 2 \mathrm{~B}(\mathrm{~g})+\mathrm{C}(\mathrm{g})$ is a first order reaction. It was started with pure A
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MCQ+4 / -12025
30Chemical Kinetics And Nuclear Chemistry
A person's wound was exposed to some bacteria and then bacterial growth started to happen at the same place. The wound was later treated with some antibacterial medicine and the rate of bacterial decay(r) was found to be proportional with t...
MCQ+4 / -12025
31Chemical Kinetics And Nuclear Chemistry
A(g) → B(g) + C(g) is a first order reaction.
Time
t
∞
Psystem
Pt
P∞
The reaction was started with reactant A only. Which of the following expressions is correct for ra...
Time
t
∞
Psystem
Pt
P∞
The reaction was started with reactant A only. Which of the following expressions is correct for ra...
MCQ+4 / -12025
32Chemical Kinetics And Nuclear Chemistry
Rate law for a reaction between $A$ and $B$ is given by
\(\mathrm{r}=\mathrm{k}[\mathrm{~A}]^{\mathrm{n}}[\mathrm{~B}]^{\mathrm{m}}\)
If concentration of $A$ is doubled and concentration of $B$ is halved from their initial value, the ratio ...
\(\mathrm{r}=\mathrm{k}[\mathrm{~A}]^{\mathrm{n}}[\mathrm{~B}]^{\mathrm{m}}\)
If concentration of $A$ is doubled and concentration of $B$ is halved from their initial value, the ratio ...
MCQ+4 / -12025
33Chemical Kinetics And Nuclear Chemistry
For $\mathrm{A}_2+\mathrm{B}_2 \rightleftharpoons 2 \mathrm{AB}$
$\mathrm{E}_{\mathrm{a}}$ for forward and backward reaction are 180 and $200 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively
If catalyst lowers $\mathrm{E}_{\mathrm{a}}$ for bot...
$\mathrm{E}_{\mathrm{a}}$ for forward and backward reaction are 180 and $200 \mathrm{~kJ} \mathrm{~mol}^{-1}$ respectively
If catalyst lowers $\mathrm{E}_{\mathrm{a}}$ for bot...
MCQ+4 / -12025
34Chemical Kinetics And Nuclear Chemistry
Half life of zero order reaction $\mathrm{A} \rightarrow$ product is 1 hour, when initial concentration of reactant is $2.0 \mathrm{~mol} \mathrm{~L}{ }^{-1}$. The time required to decrease concentration of A from 0.50 to $0.25 \mathrm{~mol...
MCQ+4 / -12025
35Chemical Kinetics And Nuclear Chemistry
Consider the following plots of $\log$ of rate constant $\mathrm{k}(\log \mathrm{k})$ vs $\frac{1}{\mathrm{~T}}$ for three different reactions. The correct order of activation energies of these reactions is :
MCQ+4 / -12025
36Chemical Kinetics And Nuclear Chemistry
In a reaction $A+B \rightarrow C$, initial concentrations of $A$ and $B$ are related as $[A]_0=8[B]_0$. The half lives of $A$ and $B$ are 10 min and 40 min , respectively. If they start to disappear at the same time, both following first or...
MCQ+4 / -12025
37Chemical Kinetics And Nuclear Chemistry
Consider the following statements related to temperature dependence of rate constants.
Identify the correct statements.
A. The Arrhenius equation holds true only for an elementary homogenous reaction.
B. The unit of $A$ is same as that of $...
Identify the correct statements.
A. The Arrhenius equation holds true only for an elementary homogenous reaction.
B. The unit of $A$ is same as that of $...
MCQ+4 / -12025
38Chemical Kinetics And Nuclear Chemistry
For the reaction A $\to$ products.
The concentration of A at 10 minutes is _________ $\times 10^{-3} \mathrm{~mol} \mathrm{~L}^{-1}$ (nearest integer). The reaction was started with $2.5 \mathrm{~mol} \mathrm{~L}^{-1}$ of A .
The concentration of A at 10 minutes is _________ $\times 10^{-3} \mathrm{~mol} \mathrm{~L}^{-1}$ (nearest integer). The reaction was started with $2.5 \mathrm{~mol} \mathrm{~L}^{-1}$ of A .
INTEGER+4 / -12025
39Chemical Kinetics And Nuclear Chemistry
For the reaction $\mathrm{A} \rightarrow \mathrm{B}$ the following graph was obtained. The time required (in seconds) for the concentration of A to reduce to $2.5 \mathrm{~g} \mathrm{~L}^{-1}$ (if the initial concentration of A was $50 \mat...
INTEGER+4 / -12025
40Chemical Kinetics And Nuclear Chemistry
Reactant A converts to product D through the given mechanism (with the net evolution of heat): A → B slow; ΔH = +ve B → C fast; ΔH = -ve C → D fast; ΔH = -ve Which of the following represents the above reaction m...
MCQ+4 / -12025
41Chemical Kinetics And Nuclear Chemistry
The reaction $A_2 + B_2 \rightarrow 2AB$ follows the mechanism:$A_2 \overset{k_1}{\underset{k_{-1}}{\rightleftharpoons}} A + A$ (fast)$A + B_2 \xrightarrow{k_2} AB + B$ (slow)$A + B \rightarrow AB$ (fast)The overall order of the reaction is...
MCQ+4 / -12025
42Chemical Kinetics And Nuclear Chemistry
Drug $X$ becomes ineffective after $50 \%$ decomposition. The original concentration of drug in a bottle was $16 \mathrm{mg} / \mathrm{mL}$ which becomes $4 \mathrm{mg} / \mathrm{mL}$ in 12 months. The expiry time of the drug in months is _...
MCQ+4 / -12025
43Chemical Kinetics And Nuclear Chemistry
For a given reaction $\mathrm{R} \rightarrow \mathrm{P}, \mathrm{t}_{1 / 2}$ is related to $[\mathrm{A}]_0$ as given in table.
Given: $\log 2=0.30$
Which of the following is true?
A. The order of the reaction is $1 / 2$.
B. If $[\mathrm{A}...
MCQ+4 / -12025
44Chemical Kinetics And Nuclear Chemistry
For bacterial growth in a cell culture, growth law is very similar to the law of radioactive decay. Which of the following graphs is most suitable to represent bacterial colony growth ? Where N - Number of Bacteria at any time, $\mathrm{N}_...
MCQ+4 / -12025
45Chemical Kinetics And Nuclear Chemistry
Consider an elementary reaction
\(\mathrm{A}(\mathrm{~g})+\mathrm{B}(\mathrm{~g}) \rightarrow \mathrm{C}(\mathrm{~g})+\mathrm{D}(\mathrm{~g})\)
If the volume of reaction mixture is suddenly reduced to $\frac{1}{3}$ of its initial volume, ...
\(\mathrm{A}(\mathrm{~g})+\mathrm{B}(\mathrm{~g}) \rightarrow \mathrm{C}(\mathrm{~g})+\mathrm{D}(\mathrm{~g})\)
If the volume of reaction mixture is suddenly reduced to $\frac{1}{3}$ of its initial volume, ...
MCQ+4 / -12025
46Chemical Kinetics And Nuclear Chemistry
For a reaction, $\mathrm{N}_2 \mathrm{O}_{5(\mathrm{~g})} \rightarrow 2 \mathrm{NO}_{2(\mathrm{~g})}+\frac{1}{2} \mathrm{O}_{2(\mathrm{~g})}$ in a constant volume container, no products were present initially. The final pressure of the syst...
MCQ+4 / -12025
47Chemical Kinetics And Nuclear Chemistry
Given below are two statements :
Statement (I) : is valid for first order reaction.
Statement (II) : is valid for first order reaction.
In the light of the above statements, choose the correct answer from the options given below :
Statement (I) : is valid for first order reaction.
Statement (II) : is valid for first order reaction.
In the light of the above statements, choose the correct answer from the options given below :
MCQ+4 / -12025
48Chemical Kinetics And Nuclear Chemistry
Consider a complex reaction taking place in three steps with rate constants $\mathrm{k}_1, \mathrm{k}_2$ and $\mathrm{k}_3$ respectively. The overall rate constant $k$ is given by the expression $k=\sqrt{\frac{k_1 k_3}{k_2}}$. If the activa...
INTEGER+4 / -12025
49Chemical Kinetics And Nuclear Chemistry
For the thermal decomposition of $\mathrm{N}_2 \mathrm{O}_5(\mathrm{~g})$ at constant volume, the following table can be formed, for the reaction mentioned below.
$$2 \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g}) \rightarrow 2 \mathrm{~N}_2 \math...
$$2 \mathrm{~N}_2 \mathrm{O}_5(\mathrm{~g}) \rightarrow 2 \mathrm{~N}_2 \math...
INTEGER+4 / -12025
50Chemical Kinetics And Nuclear Chemistry
Which of the following graphs most appropriately represents a zero order reaction?
MCQ+4 / -12025