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The correct reaction profile diagram for a positive catalyst reaction.

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Important Questions on Chemical Kinetics

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The rate of a certain biochemical reaction at physiological temperature

(T)

occurs

10^{6}

times faster with enzyme than without. The change in the activation energy upon adding enzyme is:

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The rate constant of a chemical reaction at a very high temperature will approach

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The activation energy of a reaction is zero. Its rate constant at 280 K is

1.6 \times 10^{- 6} s^{- 1},

the rate constant at 300 K is

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

Slope of the straight line obtained by plotting

{log}_{10} k

against

\frac{1}{T}

represents which term?

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

Two reactions

A_{1}

and

A_{2}

have identical pre-exponential factors. The activation energy of

A_{1}

is more than

A_{2}

10 kJ {mol}^{- 1}

. If

k_{1}

and

k_{2}

are the rate constants for reactions

A_{1}

and

A_{2}

, respectively at

300 K

, then

\ln (\frac{k_{2}}{k_{1}})

is equal to

(R = 8 .314 J {mol}^{- 1} K^{- 1})

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

Which is a wrong statement?

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

For the reaction of

H_{2}

with

I_{2}

, the rate constant is

2.5 \times 10^{- 4} d m^{3} m o l^{- 1} s^{- 1}

327^{o} C

and

1.0 d m^{3} m o l - 1 s^{- 1}

527 ° C

. The activation energy for the reaction, in

k J m o l - 1

is:

(R = 8.314 J K^{- 1} m o l^{- 1})

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The rate of a reaction triples when temperature changes from

20^{0} C

50^{0} C

. The energy of activation for the reaction is

(R = 8.314 {JK}^{- 1} {mol}^{- 1})

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

Which among the following equations represents Arrhenius equation?

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The rate of a reaction quadruples when the temperature changes from

300

310 K

. The activation energy of this reaction is:

(Assume Activation energy and pre-exponential factor are independent of temperature;

\ln (2) = 0.693; R = 8.314 J {mol}^{- 1} K^{- 1}

)

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

For a reaction, consider the plot of $l n k$ versus $1 / T$ given in the figure. If the rate constant of this reaction at $400 K$ is $10^{- 5} s^{- 1}$ , then the rate constant at $500 K$ is:

Question Image

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The addition of a catalyst during a chemical reaction alters which of the following quantities?

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The rate constant $(k)$ of a reaction is measured at different temperature $(T)$ , and the data are plotted in the given figure. the activation energy of the reaction in ${kJmol}^{- 1}$ is : $(R$ is gas constant)

Question Image

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

Consider the following plots of rate constant versus

\frac{1}{T}

for four different reactions. Which of the following orders is correct for the activation energies of these reactions?
Question Image

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The rate constant is doubled when temperature increases from

27 ° C

37 ° C .

Activation energy in

kJ

is:

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The rate of chemical reaction doubles with every

10^{o} C

rise in temperature. If the reaction is carried out in the vicinity of

22^{o} C

, the activation energy of the reaction is (Given

R = 8.3 J K^{- 1} {mol}^{- 1}, \ln 2 = 0.69

and

\ln 3 = 1.1

)

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The rate constant of a reaction is given by

k = {PZe}^{- Ea / RT}

under standard notation In order to speed up the reaction, which of the following factors has to he decreased?

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The Arrhenius plots of two reactions, I and II are shown graphically-

Question Image

The graph suggests that-

MEDIUM

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The activation energy of a reaction can be determined from the slope of which of the following graphs?

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The enthalpy

(H)

of an elementary exothermic reaction

A ⇌ B

is schematically plotted against the reaction coordinate. The plots in the presence and absence of a catalyst are shown in dashed and solid lines, respectively. Identify the correct plot for the reaction.

The correct reaction profile diagram for a positive catalyst reaction.

Important Questions on Chemical Kinetics

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