For a reaction A → Products, the concentration of the reactants are: C 0 , aC 0 , a 2 C 0 , a 3 C 0 … … … . . after a time interval 0 , t , 2 t … … … , where ' a ' is a constant. Then:

reaction is of 1 st order and k = 1 t ln 1 a

reaction is of 1 st order and k = ( 1 / 1 ) In a

reaction is of 2 nd order and k = 1 / tC 0 ( 1 - a ) / a

reaction is of zero order and k = 1 t ln 1 a

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If a first order reaction is completed to the extent of $60 %$ and $20 %$ in time intervals $t_{1}$ and $t_{2},$ what is the ratio $t_{1} : t_{2} ?$

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Important Questions on Chemical Kinetics & Nuclear Chemistry

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 2 - Chemical Kinetics & Nuclear Chemistry>Exercise>Q 19

For a reaction

A \to

Products, the concentration of the reactants are:

C_{0}, {aC}_{0}, a^{2} C_{0}, a^{3} C_{0} \dots \dots \dots . .

after a time interval

0, t, 2 t \dots \dots \dots

, where '

a

' is a constant. Then:

HARD

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 2 - Chemical Kinetics & Nuclear Chemistry>Exercise>Q 20

The data for the reaction $A + B \to C$ is

Experiment	$[A]_{0}$	$[B]_{0}$	Initial rate
$1$ .	$0.012$	$0.035$	$0.10$
$2$ .	$0.024$	$0.035$	$0.80$
$3$ .	$0.012$	$0.070$	$0.10$
$4$ .	$0.024$	$0.070$	$0.80$

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 2 - Chemical Kinetics & Nuclear Chemistry>Exercise>Q 21

A + B ⟶

Product,

\frac{dx}{dt} = k {[A]}^{a} [B]^{b}

. If

(\frac{dx}{dt}) = k

, then order is ______.

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 2 - Chemical Kinetics & Nuclear Chemistry>Exercise>Q 22

For the reaction

2 A + 3 B ⟶

products,

A

is in excess and on changing the concentration of

B

from

0.1 M

0.4 M

, rate becomes doubled, Thus, the rate law is ________.

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 2 - Chemical Kinetics & Nuclear Chemistry>Exercise>Q 23

For the reaction $A ⟶$ Products, $- \frac{d [A]}{dt} = k$ and at a different time interval, $[A]$ values are

Time	$0$	$5 \min$	$10 \min$	$15 \min$
$[A]$	$20 mol$	$18 mol$	$16 mol$	$14 mol$

At $20$ minute, the rate will be

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 2 - Chemical Kinetics & Nuclear Chemistry>Exercise>Q 24

Consider the reaction

2 A (g) ⟶ 3 B (g) + C (g)

. Starting with pure

A

initially, the total pressure doubled in

3

hours. The order of the reaction might be ______.

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 2 - Chemical Kinetics & Nuclear Chemistry>Exercise>Q 25

The formation of

{NO}_{2} F

from

{NO}_{2}

and

F_{2}

as per the reaction

2 {NO}_{2} (g) + F_{2} (g) ⟶ 2 {NO}_{2} F (g)

is a second-order reaction, first order with respect to

{NO}_{2}

and first order with respect to

F_{2}

. If

{NO}_{2}

and

F_{2}

are present in a closed vessel in ratio

2 : 1

maintained at a constant temperature with an initial total pressure of

3 atm

, what will be the total pressure in the vessel after the reaction is complete?

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Practice Book for KVPY Aptitude Test - Stream SX Chemistry>Chapter 2 - Chemical Kinetics & Nuclear Chemistry>Exercise>Q 26

In a gaseous state reaction,

A_{2} (g) ⟶ B (g) + (1 / 2) C (g)

, the increase in pressure from

100 mm Hg

120 mm Hg

is noticed in

5

minutes. The rate of disappearance of

A_{2}

mm of Hg \min^{- 1}

is:

If a first order reaction is completed to the extent of 60% and 20% in time intervals t1 and t2, what is the ratio t1 : t2?

Important Questions on Chemical Kinetics & Nuclear Chemistry

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If a first order reaction is completed to the extent of $60 %$ and $20 %$ in time intervals $t_{1}$ and $t_{2},$ what is the ratio $t_{1} : t_{2} ?$