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Chemical Kinetics

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Q 1. The rate constant, the activation energy and the Arrhenius parameter of a chemical reaction at {tex} 25 ^ { \circ } \mathrm { C } {/tex} are {tex} 3.0 \times 10 ^ { - 4 }\ \mathrm { s } ^ { - 1 } , {/tex} {tex} 104.4\ \mathrm { kJ }\ \mathrm { mol } ^ { - 1 } {/tex} and {tex} 6.0 \times 10 ^ { 14 }\ \mathrm { s } ^ { - 1 } {/tex} respectively. The value of the rate constant as {tex} \mathrm { T } \rightarrow \infty {/tex} is,

{tex} 2.0 \times 10 ^ { 18 } \mathrm { s } ^ { - 1 } {/tex}

{tex} 6.0 \times 10 ^ { 14 } \mathrm { s } ^ { - 1 } {/tex}

infinity

{tex} 3.6 \times 10 ^ { 30 } \mathrm { s } ^ { - 1 } {/tex}

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Q 2. In a first order reaction the concentration of reactant decreases from {tex} 800\ \mathrm { mol } / \mathrm { dm } ^ { 3 } {/tex} to {tex} 50\ \mathrm { mol } / \mathrm { dm } ^ { 3 } {/tex} in {tex} 2 \times 10 ^ { 4 } \mathrm { sec } . {/tex} The rate constant of reaction in {tex} \mathrm { sec } ^ { - 1 }\ \mathrm { is: } {/tex}

{tex} 2 \times 10 ^ { 4 } {/tex}

{tex} 3.45 \times 10 ^ { - 5 } {/tex}

{tex} 1.386 \times 10 ^ { - 4 } {/tex}

{tex} 2 \times 10 ^ { - 4 } {/tex}

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Q 3. {tex} \mathrm { Ag } ^ { + } + \mathrm { NH } _ { 3 } \rightleftharpoons \left[ \mathrm { Ag } \left( \mathrm { NH } _ { 3 } \right) \right] ^ { + } ; k _ { 1 } = 6.8 \times 10 ^ { - 3 } {/tex}

{tex} \left[ \mathrm { Ag } \left( \mathrm { NH } _ { 3 } \right) \right] ^ { + } + \mathrm { NH } _ { 3 } \rightleftharpoons \left[ \mathrm { Ag } \left( \mathrm { NH } _ { 3 } \right) _ { 2 } \right] ^ { + } ; \mathrm { k } _ { 2 } = 1.6 \times 10 ^ { - 3 } {/tex}

then the formation constant of {tex} \left[ \mathrm { Ag } \left( \mathrm { NH } _ { 3 } \right) _ { 2 } \right] ^ { + } {/tex} is

{tex} 6.8 \times 10 ^ { - 6 } {/tex}

{tex} 1.08 \times 10 ^ { - 5 } {/tex}

{tex} 1.08 \times 10 ^ { - 6 } {/tex}

{tex} 6.8 \times 10 ^ { - 5 } {/tex}

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Q 4. In the reaction,

{tex} \mathrm { P } + \mathrm { Q } \longrightarrow \mathrm { R } + \mathrm { S } {/tex}

The time taken for {tex} 75 \% {/tex} reaction of {tex} \mathrm { P } {/tex} is twice the time taken for {tex} 50 \% {/tex} reaction of {tex} \mathrm { P } {/tex}. The concentration of {tex} \mathrm { Q } {/tex} varies with reaction time as shown in the figure. The overall order of the reaction is

2

3

0

1

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Q 5. For the elementary reaction {tex} M \rightarrow N {/tex}, the rate of disappearance of {tex} M {/tex} increases by a factor of 8 upon doubling the concentration of {tex} M . {/tex} The order of the reaction with respect to {tex} M {/tex} is

4

3

2

1

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Q 6.

What can you say about the existence of A if the potential energy diagram for the reaction

looks like

A will exist

A will not exist

B will not exist

A and B are in equilibrium

Factual statement

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Q 7.

A catalyst only

Decreases activation energy

Increases activation energy

Both of them

Comes to equilibrium

Factual statement

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Q 8.

Product, . After 10 min reaction is 10% completed. If , then is approximately

0.693 min

69.3 min

66.0 min

0.0693 min

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Q 9.

For an endothermic reaction, where

Less than

Zero

More than

Equal to

For endothermic reaction:

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Q 10.

In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M in 15 min. The time taken for the concentration to change from 0.1 M to 0.025 M is

60 min

15 min

7.5 min

30 min

Thus, total time

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Q 11.

For a first order reaction

The pre-exponential factor

Comparing the slope and intercept of the given equation with the following Arrhenius equation :

Hence,

Comparing slope gives

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Q 12.

In a second order reaction, 20% of a substance is dissociated in 40 min. The time taken by 80% of its dissociation is

160 min

640 min

200 min

320 min

For second order reaction,

When

When

From equations (i) and (ii),

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Q 13.

For the chemical reaction

3/2, 2;7/2

2, 3/2; 7/2

5/2, 2:9/2

2, 5/2; 9/2

Sove for

Order w.r.t.

Total order

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Q 14.

What specific name can be given to the following sequence of steps:

Fluorescence

Phosphorescence

Photosensitization

Chemiluminescence

Factual statement

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Q 15.

For a second order reaction

Second order reactions: Reaction rate depends upon the concentration of two reactants

When concentrations of both the reactants are same,

(

Half-life period,

Plot of rate versus

Plot of

Plot of

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Q 16.

It is generalized that a

“Formula and Concepts”

Only reactions whose

**Alternatively**

Use Arrhenius equation

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Q 17.

A Geigger Muller counter is used to study the radioactive process. In the absence of radioactive substance A, it counts 3 disintegration per second (dps). At the start in the presence of A, it records 23 dps; and after 10 min 13 dps

What does it count after 20 min?

What is the half life of A?

a)

8 dps, 10 min

5 dps, 10 min

5 dps, 20 min

5 dps, 5 min

In the absence of A,3 dps is zero error, hence

Initial count

After 10 min

After 20 min

(50% fall in 10 min,

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Q 18.

The reaction kinetics can be studied by

Measurement of pH

Titration with hypo after adding KI

Both correct

None is correct

Cl attached to N in reactant oxidizes KI to

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Q 19.

Diazonium salt decomposes as

At

A first order reaction

A second order reaction

Independent of the initial concentration of reactant

A zero order reaction

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Q 20.

In a reaction carried out at 500 K, 0.001% of the total number of collisions are effective. The energy of activation of the reaction is approximately

Zero

The fraction of molecules having energy equal to or greater than

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Q 21.

If a reaction involves gaseous reactants and products, the units of its rate are

atm

atm-s

atm-

Factual statement

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Q 22.

For a reaction

Factual statement

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Q 23.

The rate constant, the activation energy, and the Arrhenius parameter of a chemical reaction at

Infinity

As

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Q 24.

In an acidic medium, the rate of reaction between

It means

The rate constant of overall reaction is

The rate of reaction is independent of the concentration of acid

The change in pH of the solution will not affect the rate

Doubling the concentration of

Order w.r.t.

Hence, doubling the concentration of

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Q 25.

The quantum yield of photosynthesis of

None

Negative catalyst or inhibitors are those substance which decrease the rate of a reaction

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