Chemical Kinetics Test

Result

Chemical Kinetics Test - 9

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Weekly Quiz Competition

Question 1
4 / -1

The half life of a first order reaction is equal to:

A
k

B
Cannot be predicted

C
0.693/k

D
1/k

Solution

The correct answer is Option C
For a first-order reaction, the half-life is given by: t_1/2 = 0.693/k
Question 2
4 / -1

For zero order reaction, linear plot was obtained for [A] vs t, the slope of the line is equal to:

A
-k_o

B
k_o

C
-k_o /2.303

D
0.693/ k_o

Solution

For zero order reaction the rate equation is [A] = -kt + [Ao]
Thus the slope of the line is -ko
Question 3
4 / -1

The first order rate constant for the decomposition of N₂O₅ is 6.2 x 10^-4 sec^-1. The t_1/2 of the decomposition reaction is

A
228.4 sec

B
1117.7 sec

C
111.7 sec

D
168.9 sec

Solution

The correct answer is option B
t_1/2 = k0.693
= 0.693/(6.2 × 10^{− 4}) = 1117.7s
Question 4
4 / -1

Find the overall order of a reaction whose rate constant is k = 3x10^-4 s^-1

A
Third

B
Second

C
Zero

D
First

Solution

The correct answer is option D
Units:- for K can be calculated by (Mole)^1-n (Litre )^n-1 Time ^-1...
Here,n is the order of the reaction ....
On substituting n = 1.
We get, K units as;
K = (Mole)^1-1( Litre)^1-1 sec^-1.
K=sec-1.......
Question 5
4 / -1

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

A

B

C

D

Solution

The correct answer is option A
As we know, for a first order reaction,
Question 6
4 / -1

The type of reaction that gives constant half life is

A
First order reaction

B
Third order reaction

C
Second order reaction

D
Zero order reaction

Solution

The correct answer is Option A
For first order reaction, the half-life period is independent of initial concentration.
For first order reaction, the half-life period expression (t1/2) is given by the expression t1/2= , where k is the rate constant.
Question 7
4 / -1

The half life period of first order reaction is 15 min. Its rate constant will be equal to

A
0.0462 min^-1

B
0.462 min^-1

C
0.00462 min^-1

D
0.562 min^-1

Solution

The half life of a reaction is 15 min
So,
Here we go..
Formula to be used :

K =0.693/t = 0.693/15
__= 0.462/10 = 0.0462 min^-1
Question 8
4 / -1

For zero order reaction, the integrated rate equation is:

A

B

C

D
Question 9
4 / -1

The half life of a zero order reaction is equal to:

A

B

C

D

Solution

[A] = -kt + [A]₀
Here, [A] = [A₀]/2
[A]₀/2 = -kt + [A]₀
kt = [A]₀ - [A]0/2
t = [A]₀/2k
t_1/2 = [A]₀/2k
Question 10
4 / -1

If [A] is the concentration of reactant A at any time t and [A_o] is the concentration at t=0, then for the first order reaction the rate equation can be written as:

A

B

C

D