Chemical Kinetics Test

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Chemical Kinetics Test - 5

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Question 1
1 / -0

The chemical reaction in which reactants require high amount of activation energy are generally

A
Instantaneous

B
Fast

C
Slow

D
Spontaneous

Solution

As the energy of activation increases, more energy is required for reactants to complete the reaction hence chemical reaction become slow.
Question 2
1 / -0

Straight line graph for first order reaction is obtained between

A
Log[R_o] & t

B
ln[R] & t

C
[R] & t

D
None of these

Solution
Question 3
1 / -0

Which of the following represents the expression for 3/4^th life of a first order reaction?

A
log 4/3

B
log 3/4

C
log 3

D
log 4
Question 4
1 / -0

The rate of chemical reaction becomes double for every 10^o rise in temperature because of

A
Increase in activation energy

B
Increase in number of collisions between molecules having energy greater than activation energy

C
Increase in number of activated molecules

D
Decrease in activation energy

Solution

With increase in temperature molecular collisions increases therefore rate of reaction doubles. With every 10⁰ rise in teperature, the number of molcules which bring about the chemical reaction become double, so rate of chemical reaction also double.
Question 5
1 / -0

A substance (initial concentration 'a') reacts according to zero-order kinetics. The time it takes for the completion of the reaction is

A
a/k

B
a/2k

C
k/a

D
2k/a
Question 6
1 / -0

The minimum amount of energy required by the reacting molecules at the time of collisions in order to produce effective collisions is called

A
Internal energy

B
Potential energy

C
Threshold energy

D
Activation energy

Solution

The minimum amount of energy required by the reacting molecules at the time of collisions in order to produce effective collisions is called threshold energy.
Question 7
1 / -0

The rate of a certain reaction increases by 2.5 times when the temperature is raised from 300 K to 310 K. If 'k' is the rate constant at 300 K, then the rate constant at 310 K will be equal to

A
k

B
2k

C
2.5k

D
3k
Question 8
1 / -0

The second order rate constant is usually expressed as

A
mole litre sec^-1

B
mole^-1 litre^-1 sec^-1

C
mole litre^-1 sec^-1

D
mole^-1 litre sec^-1
Question 9
1 / -0

Directions: The following question has four choices, out of which ONLY ONE is correct.

The decomposition of SO₂Cl₂ to SO₂ and Cl₂ is a first order reaction. When 0.10 mol of SO₂Cl₂ (g) is heated at 600 K in a 1.0 L vessel, the total pressure changes from 4.91 atm to 9.50 atm in 16 hours. Which of the following statements is correct?

A
Rate constant of the reaction is 0.17 hour^–1.

B
Half-life of the reaction is 2.1 hours.

C
Total pressure after 4 hours will be 9.0 atm.

D
The reaction will be completed in 32 hours.
Question 10
1 / -0

Which of the following statements regarding the factors affecting the chemical reactions is incorrect?

A
The rate of photochemical reaction is independent of radiations.

B
A catalyst increases the rate of a chemical reaction at a particular temperature only.

C
The rate of chemical reaction is directly proportional to the concentration of the reactants.

D
The rate of chemical reaction depends on the number of collisions.
Question 11
1 / -0

Directions: The following question has four choices out of which ONLY ONE is correct.

On fermentation of sugar in an enzymatic solution that is initially 0.24 M, the concentration of sugar reduces to 0.06 M in 20 hours and 0.015 M in 40 hours. Which of the following statements is correct?

A
The reaction is not of first order.

B
Half-life of the reaction is 10 hours.

C
The rate constant of the reaction is 5.9 10^-5s^-1.

D
Half-life remains the same if the temperature increases by 10^oC.
Question 12
1 / -0

Velocity constant of a reaction at 290 K was found to be 3.2 x 10^-3. At 300 K, it will be

A
1.28 x 10^-2

B
9.6 x 10^-3

C
6.4 x 10^-3

D
3.2 x 10^-4
Question 13
1 / -0

The rate constant of a reaction increases by 5% when its temperature is raised from 27^oC to 28^oC. The activation energy of the reaction is

A
16.6 kJ/mol

B
26.6 kJ/mol

C
36.6 kJ/mol

D
46.6 kJ/mol
Question 14
1 / -0

Directions: The following question has four choices out of which ONLY ONE is correct.

The experimental rate law for a reaction 2A + 2B P is R = C_aC_b^1/2. If the concentrations of both A and B are doubled, the rate of reaction is increased by

A
1.414 times

B
5.64 times

C
2.82 times

D
4 times

Question 15

1 / -0

Directions: The following question has four choices out of which ONLY ONE is correct.

The experimental data for the reaction 2A + B₂

2AB is given in the table below:

Experiment	[A]	[B₂]	Rate (mole s ^-1)
1	0.50	0.50	1.6 × 10^–4
2	0.50	1.00	3.2 × 10^–4
3	1.00	1.00	3.2 × 10^–4

The rate equation for the above data is

rate = k[B₂]

rate = k[B₂]²

rate = k[A]²[B]²

rate = k[A]²[B]

Question 16
1 / -0

For an endothermic reaction, where H represents the enthalpy of the reaction in kJ/mol, the minimum value for the energy of activation will be

A
less than H

B
zero

C
more than H

D
equal to H
Question 17
1 / -0

Directions: The following question has four choices out of which ONLY ONE is correct.

Which of the following methods is used to determine the order of a reaction with respect to one reactant at a time?

A
Ostwald isolation method

B
Hit and trial method

C
Graphical method

D
Half-life method
Question 18
1 / -0

For the reaction system, 2NO(g) + O₂(g) 2NO₂(g), volume is suddenly reduced to half its value by increasing the pressure on it. If the reaction is of first order with respect to O₂ and second order with respect to NO, the rate of reaction will

A
diminish to one-fourth of its initial value

B
diminish to one-eighth of its initial value

C
increase to eight times its initial value

D
increase to four times its initial value
Question 19
1 / -0

Directions: The following question has four choices out of which ONLY ONE is correct.

The reaction follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B?

A
0.25 hour

B
2 hours

C
1 hour

D
0.5 hour
Question 20
1 / -0

The effect of temperature on reaction rate is given by

A
Clausius Claperon equation

B
Gibb’s Helmholtz equation

C
Arrhenius equation

D
Kirchoff’s equation

Solution

Arhenius gives relation between rate contan t (k) and temperature (T) is as follows:
k = A e−E_a/T
taking log on both sides, we get.
ln k = ln A−E_a/T
Question 21
1 / -0

A first order reaction is 50% complete in 30 minutes at 27^oC and in 10 minutes at 47^oC. The energy of activation of the reaction is

A
30.00 kJ/mol

B
34.84 kJ/mol

C
43.85 kJ/mol

D
84.00 kJ/mol
Question 22
1 / -0

If a reaction A + B → C is exothermic to the extent of 30 kJ/mol and the forward reaction has an activation energy of 70 kJ/mol, the activation energy for the reverse reaction is

A
30 kJ/mol

B
40 kJ/mol

C
70 kJ/mol

D
100 KJ/mol
Question 23
1 / -0

For a chemical reaction A B, it is found that the rate of reaction doubles when the concentration of A is increased four times. The order, in terms of A, for this reaction is

A
two

B
one

C
half

D
zero
Question 24
1 / -0

A large increase in the rate constant with small rise in temperature for a gaseous reaction is indicative of

A
large number of collisions at higher temperature

B
high value of activation energy of the reaction

C
high value of the pre-exponential factor

D
increase in the average speed of the molecules
Question 25
1 / -0

In 32 minutes, 75% of a first order reaction was found to be complete. When will 50% of the same reaction be complete?

A
4 minutes

B
8 minutes

C
16 minutes

D
24 minutes

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Chemical Kinetics Test - 5

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Chemical Kinetics Test - 5

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Question 1

Instantaneous

Fast

Slow

Spontaneous

Solution

Question 2

Log[Ro] & t

ln[R] & t

[R] & t

None of these

Solution

Question 3

log 4/3

log 3/4

log 3

log 4

Question 4

Increase in activation energy

Increase in number of collisions between molecules having energy greater than activation energy

Increase in number of activated molecules

Decrease in activation energy

Solution

Question 5

a/k

a/2k

k/a

2k/a

Question 6

Internal energy

Potential energy

Threshold energy

Activation energy

Solution

Question 7

k

2k

2.5k

3k

Question 8

mole litre sec-1

mole-1 litre-1 sec-1

mole litre-1 sec-1

mole-1 litre sec-1

Question 9

Rate constant of the reaction is 0.17 hour–1.

Half-life of the reaction is 2.1 hours.

Total pressure after 4 hours will be 9.0 atm.

The reaction will be completed in 32 hours.

Question 10

The rate of photochemical reaction is independent of radiations.

A catalyst increases the rate of a chemical reaction at a particular temperature only.

The rate of chemical reaction is directly proportional to the concentration of the reactants.

The rate of chemical reaction depends on the number of collisions.

Question 11

The reaction is not of first order.

Half-life of the reaction is 10 hours.

The rate constant of the reaction is 5.9 10-5 s-1.

Half-life remains the same if the temperature increases by 10oC.

Question 12

1.28 x 10-2

9.6 x 10-3

6.4 x 10-3

3.2 x 10-4

Question 13

16.6 kJ/mol

26.6 kJ/mol

36.6 kJ/mol

46.6 kJ/mol

Question 14

1.414 times

5.64 times

Log[R_o] & t

mole litre sec^-1

mole^-1 litre^-1 sec^-1

mole litre^-1 sec^-1

mole^-1 litre sec^-1

Rate constant of the reaction is 0.17 hour^–1.

The rate constant of the reaction is 5.9 10^-5s^-1.

Half-life remains the same if the temperature increases by 10^oC.

1.28 x 10^-2

9.6 x 10^-3

6.4 x 10^-3

3.2 x 10^-4

rate = k[B₂]

rate = k[B₂]²

rate = k[A]²[B]²

rate = k[A]²[B]