MEDIUM

JEE Main

IMPORTANT

Earn 100

A bacterial infection in an internal wound grows as $N^{'} (t) = N_{0} e x p (t)$ , where the time $t$ is in hours. A dose of antibiotic, taken orally, needs 1 hour to reach the wound. Once it reaches there, the bacterial population goes down as $\frac{d N}{d t} = - 5 N^{2}$ . What will be the plot of $\frac{N_{0}}{N}$ vs $t$ after $1$ hour?

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Important Questions on Chemical Kinetics

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 10 - Chemical Kinetics>JEE Main - 24 June 2022 Shift 2>Q 76

For a first order reaction, the time required for completion of $90 %$ reaction is ' $x$ ' times the half life of the reaction. The value of ' $x$ ' is

(Given: $\ln 10 = 2.303$ and $\log 2 = 0.3010$ )

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 10 - Chemical Kinetics>JEE Main - 25 June 2022 Shift 1>Q 77

For a given chemical reaction

γ_{1} A + γ_{2} B \to γ_{3} C + γ_{4} D

. Concentration of

C

changes from

10 mmol {dm}^{- 3}

20 mmol {dm}^{- 3}

10 s .

Rate of appearance of

D

1.5

times the rate of disappearance of

B

which is twice the rate of disappearance

A

. The rate of appearance of

D

has been experimentally determined to be

9 mmol {dm}^{- 3} s^{- 1} .

Therefore the rate of reaction is____

mmol {dm}^{- 3} s^{- 1} .

(Nearest Integer)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 10 - Chemical Kinetics>JEE Main - 26 June 2022 Shift 2>Q 79

Catalyst A reduces the activation energy for a reaction by

10 kJ {mol}^{- 1}

300 K

. The ratio of rate constants,

\frac{k_{Catalysed}}{k_{Uncatalysed}}

e^{x}

. The value of

x

is____[nearest integer] [Assume that the pre-exponential factor is same in both the cases. Given

R = 8.314 J K^{- 1} {mol}^{- 1}

]

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 10 - Chemical Kinetics>JEE Main - 26 June 2022 Shift 1>Q 80

A flask is filled with equal moles of

A

and

B

. The half lives of

A

and

B

are

100 s

and

50 s

respectively and are independent of the initial concentration. The time required for the concentration of

A

to be four times that of

B

is____

s

.
(Given :

\ln 2 = 0.693

)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 10 - Chemical Kinetics>JEE Main - 27 June 2022 Shift 2>Q 82

It has been found that for a chemical reaction with rise in temperature by

9 K

the rate constant gets doubled. Assuming a reaction to be occurring at

300 K

, the value of activation energy is found to be

{kJmol}^{- 1}

. [nearest integer] (Given

\ln 10 = 2.3, R = 8.3 J K^{- 1} {mol}^{- 1}, \log 2 = 0.30

)

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 10 - Chemical Kinetics>JEE Main - 28 June 2022 Shift 1>Q 83

For a first order reaction

A \to B

, the rate constant,

k = 5.5 \times 10^{- 14} s^{- 1}

. The time required for

67 %

completion of reaction is

x \times 10^{- 1}

times the half life of reaction. The value of

x

is_________ (Nearest integer) (Given :

\log 3 = 0.4771

)

MEDIUM

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 10 - Chemical Kinetics>JEE Main - 28 June 2022 Shift 2>Q 84

A radioactive element has a half life of

200

days. The percentage of original activity remaining after

83

days is____(Nearest integer)
(Given : antilog

0.125 = 1.333

, antilog

0.693 = 4.93

)

HARD

JEE Main

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR CHEMISTRY>Chapter 10 - Chemical Kinetics>JEE Main - 29 June 2022 Shift 1>Q 85

The activation energy of one of the reactions in a biochemical process is

532611 J {mol}^{- 1}

. When the temperature falls from

310 K

300 K

, the change in rate constant observed is

k_{300} = x \times 10^{- 3} k_{310 °}

. The value of

x

is
[Given:

\ln 10 = 2.3 R = 8.3 J K^{- 1} {mol}^{- 1}

]

A bacterial infection in an internal wound grows as N't=N0exp⁡(t) , where the time t is in hours. A dose of antibiotic, taken orally, needs 1 hour to reach the wound. Once it reaches there, the bacterial population goes down as dNdt=-5N2 . What will be the plot of N0N vs t after 1 hour?

Important Questions on Chemical Kinetics

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