Chemical Kinetics PYQs - Last 10 Years

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Practice 30 NEET 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 10 Years Chemical Kinetics Questions

Showing 30 of 30 filtered questions.

1Chemical Kinetics

For an elementary chemical reaction, the Arrhenius plot is given below.
If the energy of activation is $6.64 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and $\mathrm{R}=8.3 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$, the temperature at which the...

2Chemical Kinetics

$2 A \xrightarrow{k} B$ is a zero-order reaction, where $k=1.0 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~min}^{-1}$. If the initial concentration of $A$ is 2 M , then the time taken to complete $75 \%$ of the reaction will be

3Chemical Kinetics

For a certain reaction $R \rightarrow$ Product, the plot of concentration $[R]$ vs time has a negative slope as shown. The order of reaction is :

4Chemical Kinetics

Given below is an expression for the rate constant of a first-order reaction occurring at a certain temperature, $\mathrm{T}(\mathrm{K})$.
\(\operatorname{lnk}=14.34-\frac{1.25 \times 10^4}{T}\)
The energy of activation in $\mathrm{kcal} ...

5Chemical Kinetics

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6Chemical Kinetics

If the half-life ( $t_{1 / 2}$ ) for a first order reaction is 1 minute, then the time required for $99.9 \%$ completion of the reaction is closest to :

7Chemical Kinetics

If the rate constant of a reaction is $0.03 \mathrm{~s}^{-1}$, how much time does it take for $7.2 \mathrm{~mol} \mathrm{~L}^{-1}$ concentration of the reactant to get reduced to $0.9 \mathrm{~mol} \mathrm{~L}^{-1}$ ?
(Given: $\log 2=0.301$...

8Chemical Kinetics

Rate constants of a reaction at \(500 \mathrm{~K}\) and \(700 \mathrm{~K}\) are \(0.04 \mathrm{~s}^{-1}\) and \(0.14 \mathrm{~s}^{-1}\), respectively; then, activation energy of the reaction is :
(Given: $$\log 3.5=0.5441, \mathrm{R}=8.31 \...

9Chemical Kinetics

Which of the following plot represents the variation of \(\ln \mathrm{k}\) versus \(\frac{1}{\mathrm{~T}}\) in accordance with Arrhenius equation?

10Chemical Kinetics

Following data is for a reaction between reactants A and B :

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11Chemical Kinetics

Which plot of \(\ln \mathrm{k}\) vs \(\frac{1}{\mathrm{~T}}\) is consistent with Arrhenius equation?

12Chemical Kinetics

The rate of a reaction quadruples when temperature changes from \(27^{\circ} \mathrm{C}\) to \(57^{\circ} \mathrm{C}\). Calculate the energy of activation.
Given $$\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}, \log 4=0.6...

13Chemical Kinetics

Activation energy of any chemical reaction can be calculated if one knows the value of

14Chemical Kinetics

The correct options for the rate law that corresponds to overall first order reaction is

15Chemical Kinetics

For a reaction \(3 \mathrm{~A} \rightarrow 2 \mathrm{~B}\)
The average rate of appearance of \(\mathrm{B}\) is given by \(\frac{\Delta[B]}{\Delta t}\). The correct relation between the average rate of appearance of \(\mathrm{B}\) with the a...

16Chemical Kinetics

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : A reaction can have zero activation energy.
Reason R : The minimum extra amount of energy absorbed by reactant molecules so ...

17Chemical Kinetics

For a certain reaction, the rate \(=\mathrm{k}[\mathrm{A}]^{2}[\mathrm{~B}]\), when the initial concentration of A is tripled keeping concentration of \(\mathrm{B}\) constant, the initial rate would

18Chemical Kinetics

For a chemical reaction
4A + 3B \(\to\) 6C + 9D
Rate of formation of C is 6 \(\times\) 10\(-\)2 mol L\(-\)1 s\(-\)1 and rate of disappearance of A is 4 \(\times\) 10\(-\)2 mol L\(-\)1 s\(-\)1. The rate of reaction and amount of B consumed i...

19Chemical Kinetics

For a first order reaction A \(\to\) Products, initial concentration of A is 0.1 M, which becomes 0.001 M after 5 minutes. Rate constant for the reaction in min\(-\)1 is

20Chemical Kinetics

The given graph is a representation of kinetics of a reaction

The y and x axes for zero and first order reactions, respectively are

21Chemical Kinetics

The slope of Arrhenius plot \(\left( {\ln \,k\,v/s{1 \over T}} \right)\) of first order reactino is \(-\)5 \(\times\) 103K. The value of Ea of the reaction is. Choose the correct option for your answer.[Given R = 8.314 JK\(-\)1mol\(-\)1]

22Chemical Kinetics

For a reaction, A \(\to\) B, enthalpy of reaction is \(-\)4.2 kJ mol\(-\)1 and enthalpy of activation is 9.6 kJ mol\(-\)1. The correct potential energy profile for the reaction is shown in option.

23Chemical Kinetics

The rate constant for a first order reaction is 4.606 \(\times\) 10-3 s-1. The time required to reduce 2.0 g of the reactant to 0.2 g is :

24Chemical Kinetics

An increase in the concentration of the reactants of a reaction leads to change in :

25Chemical Kinetics

For the chemical reaction
N2(g) + 3H2(g) ⇌ 2NH3(g)
the correct option is :

26Chemical Kinetics

If the rate constant for a first order reaction is k, the time (t) required for the completion of 99 % of the
reaction is given by :

27Chemical Kinetics

When initial concentration of the reactant is
doubled, the half-life period of a zero order
reaction

28Chemical Kinetics

The correct difference between first and
second order reactions is that

29Chemical Kinetics

Mechanism of a hypothetical reaction
X2 + Y2 \(\to\) 2XY, is given below :
(i) X2 \(\to\) X + X (fast)
(ii) X + Y2 \(\rightleftharpoons\) XY + Y (slow)
(iii) X + Y \(\to\) XY (fast)
The overall order of the reaction will be

30Chemical Kinetics

A first order reaction has a specific reaction rate of 10\(-\)2 sec\(-\)1. How much time will it take for 20 g of the reactant to reduce to 5 g?