EASY

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The correct reaction profile diagram for a positive catalyst reaction.

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Important Questions on Chemical Kinetics

HARD

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

Consider the following reversible reaction:

A (g) + B (g) ⇌ AB (g)

The activation energy of the backward reaction exceeds that of the forward reaction by

2 RT

(in

{mol}^{- 1}

). If the pre-exponential factor of the forward reaction is

4

times that of the reverse reaction, the absolute value of

∆ G^{⊝} (in J {mol}^{- 1})

for the reaction at

300 K

is ____.

(Given;

\ln (2) = 0 .7, = 2500 J {mol}^{- 1} at 300 K

and

G

is the Gibbs energy)

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

The following reaction can be accelerated in the presence of_____component

2 {KClO}_{3} \to 2 KCl + 3 O_{2}

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

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})

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

What is autocatalysis?

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

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

What are catalytic promoters? Give one example.

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

In Haber’s process of ammonia synthesis, presence of traces of

H_{2} S

retards the rate of the reaction. Why?

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

Which among the following equations represents Arrhenius equation?

EASY

Chemistry>Physical Chemistry>Chemical Kinetics>Arrhenius Collision Theory

In manufacturing of sulphuric acid in presence of platinum catalyst, which metal impurity acts as catalytic poison?

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}

)

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.

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-