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For the reaction A {k_{-1}}{{k_{1}}{}} P. Following data is pr

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Medium

Solving time: 3 mins

For the reaction $A k_{- 1} ⇋ k_{1} P$ . Following data is produced: $Time/Hr. % A 0100 1 72.5 2 56.8 3 45.6 4 39.5 \infty 30$

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Book:

Physical Chemistry II for IIT JEE Main and Advance (McGraw Hill)

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For the reaction

A k_{- 1} ⇋ k_{1} P

. Following data is produced:

Time/Hr. % A 0100 1 72.5 2 56.8 3 45.6 4 39.5 \infty 30

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Text solutionVerified

Sol. At

t = \infty

when equilibrium is established

k = \frac{[ P ]}{[ A ]} = \frac{7}{3} = 2.33 and \frac{k _{1}}{k _{- 1}} = 2.33 \Rightarrow k_{1} = 2.33 k_{- 1} [A] = \frac{k _{2} [ A ] _{0}}{k _{1} + k _{2}} [1 - e^{- (k_{1} + k_{2}) t}] k_{- 1} = 4.16 \times 1 0^{- 5} sec^{- 1} k_{1} = 2.33 k_{- 1} = 9.7 \times 1 0^{- 5} sec^{- 1}

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Practice questions from Physical Chemistry II for IIT JEE Main and Advance (McGraw Hill)

Question 1

Hard

The rate of a chemical reaction generally increases rapidly even for small temperature increase because of rapid increase in the

collision frequency
fraction of molecules having activation energy
activation energy
average kinetic energy of molecules

Topic:

Chemical Kinetics

Book:

Physical Chemistry II for IIT JEE Main and Advance (McGraw Hill)

View solution

Question 2

Hard

Consider the following first order competing reactions:

X ⟶ k_{1} A + B

and

Y ⟶ k_{2} C + D

50%

of the reaction of

X

was completed when

96%

of the reaction of

Y

was completed, the ratio of their rate constants

(k_{2} / k_{1})

$4.06$
$0.215$
$1.1$
$4.65$

Topic:

Chemical Kinetics

Book:

Physical Chemistry II for IIT JEE Main and Advance (McGraw Hill)

View 2 solutions

Question 3

Medium

Find out the

%

of the reactant molecule crossing over the energy barrier at

325 K

given that

Δ H_{325} = 0.12 kcal

E_{a (b)} = + 0.02

cal.

Topic:

Chemical Kinetics

Book:

Physical Chemistry II for IIT JEE Main and Advance (McGraw Hill)

View solution

Question 4

Hard

A first order reaction

A ⟶ B

requires activation energy of

70 kJ mol^{- 1}

. When a

20%

solution of

A

was kept at

2 5^{\circ} C

for

20 min, 25%

decomposition took place. What will be the percent decomposition in the same time in a

30%

solution maintained at

4 0^{\circ} C

? Assume that activation energy remains constant in this range of temperature.

Topic:

Chemical Kinetics

Book:

Physical Chemistry II for IIT JEE Main and Advance (McGraw Hill)

View 2 solutions

Practice more questions from Chemical Kinetics

Question 1

Easy

If the rate of reaction between ? and ? is given by,

r a t e = k [A] [B]^{n}

, then the reaction is:

First order in A
nth order in B
Overall order is (1+n)
All are correct

Topic:

Chemical Kinetics

View 3 solutions

Question 2

Easy

Emission of

α

-particle by an atom of an element results in the formation of its:

Isotope
Isomer
Isomorph
Isobar

Topic:

Chemical Kinetics

Book:

Precalculus: Mathematics for Calculus (Standalone Book)

View solution

Question 3

Easy

The phenomenon of radioactivity arises from the:

Binary fission
Nuclear fusion
Stable nuclei
Decay of unstable nuclei

Topic:

Chemical Kinetics

Book:

Precalculus: Mathematics for Calculus (Standalone Book)

View solution

Question 4

Hard

An optically active substance,

A

, decomposes into optically active substances '

B

' and 'C' as:

A ⟶ K = 0.001 m i n^{- 1} 2 B + C

The specific rotations of

A, B

and

C

are

+ 4 0^{\circ}, + 1 0^{\circ}

and

- 3 0^{\circ}

per mole, respectively. If initially

A

and

C

were present in

4 : 3

mole ratio, the time (in min), after which the sample becomes optically inactive, is

(ln 2 = 0.7, ln 5 = 1.6, ln 7 = 2.0, ln 13 = 2.5)

Topic:

Chemical Kinetics

View solution

Practice questions on similar concepts asked by Filo students

Question 1

Oc1cccc(CBr)c1

Topic:

Alkyl Halide

View solution

Question 2

How many unpaired electrons are present in each of the following ground state atoms :
a) O and b) As

Topic:

Atomic Structure

View solution

Question 3

355 The presence of alternate single and double system or to an atom with an unshared bonds in an open chain or cyclic system is porbital. The

σ

electrons of

C - H

bond of the termed as a conjugated system. These systems alkyl group enter into partial conjugation with often show abnormal behaviour. The examples the attached unsaturated system or with the are 1,3-butadiene, aniline and nitrobenzene unshared p orbital. Hyperconjugation is a etc. In such systems, the

π

-electrons are permanent effect. delocalised and the system develops polarity.

To understand hyperconjugation effect, let 12.7.8 Electromeric Effect (E effect) us take an example of

CH_{3} CH_{2}

(ethyl cation) It is a temporary effect. The organic in which the positively charged carbon atom compounds having a multiple bond (a double has an empty porbital. One of the C-H bonds or triple bond) show this effect in the presence of the methyl group can align in the plane of of an attacking reagent only. It is defined as this empty p orbital and the electrons the complete transfer of a shared pair of constituting the

C - H

bond in plane with this

p

π

-electrons to one of the atoms joined by a orbital can then be delocalised into the empty reagent. The effect is annulled as soon as the

porbital as depicted in Fig.

12.4

(a). attacking reagent is removed from the domain of the reaction. It is represented by

E

and the shifting of the electrons is shown by a curved arrow ( electromeric effect. (i) Positive Eelctromeric Effect (

+ E

effect) In this effect the

π

-electrons of the multiple bond are transferred to that atom to wh gets attached. For example: gets attached. For example: (ii) Negative Electromeric Effect (-E effect) In this effect the

π

-electrons of the multiple bond are charge. transferred to that atom to which the attacking reagent does not get attached. For example: When inductive and electromeric effects operate in opposite directions, the electomeric effect predominates. In general, greater the number of alkyl 12.7.9 Hyperconjugation groups attached to a positively charged carbon Hyperconjugation is a general stabilising atom, the greater is the hyperconjugation interaction. It involves delocalisation of interaction. and stabilisation of the cation.

σ

electrons of

C - H

bond of an alkyl group of carbocations:

Topic:

General Organic Chemistry

View solution

Question 4

For chemical reactions, the calculation of change in entropy is normally done

At constant pressure
At constant temperature
At constant temperature and pressure both
At constant volume

Topic:

Thermochemistry

View solution

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Question Text	For the reaction $A k_{- 1} ⇋ k_{1} P$ . Following data is produced: $Time/Hr. % A 0100 1 72.5 2 56.8 3 45.6 4 39.5 \infty 30$
Topic	Chemical Kinetics
Subject	Chemistry
Class	Class 12
Answer Type	Text solution:1
Upvotes	144

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For the reaction Ak−1​⇋k1​​​P. Following data is produced: Time/Hr. % A ​0100​172.5​256.8​345.6​439.5​∞30​

Text solutionVerified

Practice questions from Physical Chemistry II for IIT JEE Main and Advance (McGraw Hill)

Practice more questions from Chemical Kinetics

Practice questions on similar concepts asked by Filo students

Related books for questions on Chemical Kinetics

For the reaction $A k_{- 1} ⇋ k_{1} P$ . Following data is produced: $Time/Hr. % A 0100 1 72.5 2 56.8 3 45.6 4 39.5 \infty 30$