Chemical Kinetics Test

Result

Chemical Kinetics Test - 10

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Question 1
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Direction : This section contains multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct.

Q. For zeroth order reaction,

A → B

[A]₀ = 0.01 M, [A]_t = 0.008Matter 10 min.

Thus, half-life is

A
5 min

B
12 min

C
16 min

D
25 min

Solution

For zeroth order reaction

When reaction is 50% completed.
Question 2
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A Certain Zeroth Order reaction has k = 0.025 Ms^-1 for the disappearance of A. What will be the concentration of A after 15s, if the intial concentration is 0.50 M?

A
0.50 M

B
0.375 M

C
0.125 M

D
0.060 M

Solution

x(product) formed after 15 s
= 0.025 Ms^-1 x 15s
= 0.375 M
Then, reactant left
= 0.500 - 0.375
= 0.125 M
Question 3
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For Zeroth Order Reaction, variation of x with time is shown as
Q. At initial concenration of the reactant as 17.32 min dm^-1 , half - life period is

A
5.0 min

B
10.0 min

C
8.66 min

D
15.0 min

Solution
Question 4
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For the first order reaction, rate constant k is given by
kt = logC₀ - log C_t
where, C₀ is the intial concenration and C_t is the concentration at time t. Graph between log C_t and time t is

A

B

C

D

Solution

This represents a straight line
Question 5
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In a first order reaction, the concentration of the reactant decreases from 0.8 M to 0.4 M is 15 min. The time taken for the concentration to change from 0.1 M to 0.025 M is

A
30 min

B
15 min

C
7.5 min

D
60 min

Solution

For first order reaction,
time = 15 min to change its concentration from 0.8 m to 0.4 m Thus, 50% reaction.
Thus, t₅₀ = 15 min
Question 6
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For the First order reaction, concentration of the reactant after two averagelives is reduced to

A
25 %

B
75%

C

D

Solution

For first order reaction,
Question 7
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The half-life period of a first order chemical reaction is 6.93 min. The time required for the completion of 99% of the chemical reaction will be (log2 = 0.3010)

A
230.3 min

B
23.03 min

C
46.06 min

D
460.6 min

Solution

∴

when, a = 100,

(a-x) = 100-99 = 1, t = t₉₉
Question 8
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For the first order reaction,

A →Product

Q. The concentration of A changes from 0.1 M to 0.025 M in 40 min. The rate of the reaction when the concentration of A is 0.01 M is

A
1.73 x 10^-6 Mmin^-1

B
3.47 x 10^-4 M min^-1

C
3.47 x 10^-5 M min^-1

D
1.73 x 10^-6 M min^-1

Solution

For the first order kinetic,
Question 9
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For the reaction,
A →Products,
Concentration of A at different time intervals are given :
At 20 min, rate will be

A
12 M min^-1

B
10 M min^-1

C
8 M min^-1

D
0.4 M min^-1

Solution
Question 10
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For the first order reaction with, C₀ as the initial concentration and C at time t, (C₀ - C) =

A
C₀ [1-e^-kt ]

B
C₀ e^-^kt

C
C₀ [1+e^kt ]

D
C₀ e^kt

Solution