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Published on: 02/09/2022
QB365 provides a detailed and simple solution for every Possible Creative Questions in Class 12 Chemistry Subject - Chemical Kinetics, English Medium. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.
Download Tamil Nadu 12th Standard Chemistry question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
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Take MCQ Chemistry Test

1.
The graph between the log K versus \(\frac { 1 }{ T } \) is a straight line. The slope of the line is______.
\(\frac { -2.303R }{ Ea } \)
\(\frac { Ea }{ 2.303R } \)
\(\frac { 2.303R }{ Ea } \)
\(\frac { Ea }{ 2.303R } \)
2.
For an exothermic chemical process occurring in 2 steps as
(i) A +B ⟶ X (slow) ;
(ii) X ⟶ AB (fast)
The progress of the reaction can be best described by (x- intermediate).
None of these
3.
Which order reaction obeys the expression \({ t }_{ \frac { 1 }{ 2 } }\alpha \frac { 1 }{ \left[ A \right] } ?\)
First
Second
Third
Zero
4.
Which of the following statement is not correct?
Molecularity of a reaction cannot be fractional
Molecularity of a reaction cannot be more than three
Molecularity of a reaction can be zero
Molecularity is assigned for each elementary step of mechanism.
5.
Which of the following does not affect the rate of reaction?
Amount of the reactant taken
Physical state of the reactant
∆H of reaction
Size of vessel
6.
The Unit of rate constant and rate of reaction are same for ______.
First order
second order
Third order
zero order
7.
It is a 2 steps reaction, step 1 is slower than step 2
It is a 2 steps reaction, step 2 is slower than step 1.
Single step reaction where B is a activated complex
Single step reaction in which B is a reaction intermediate.
8.
A+B \(\longrightarrow \) C; ∆H = 60 kJ mol-1 Eaf = 150 kJ. What is the activation energy of the backward reaction?
210 kJ
105 kJ
90 kJ
145 kJ
9.
What would be the activation energy of a reaction when the temperature is increased from 27oC to 37oC?
534 kJ mol-1
53.4 kJ mol-1
5.34 kJ mol-1
None of these
10.
The depletion of ozone involves the following steps:
Step 1: O2 +O \(\overset { { k }_{ 1 } }{ \underset { { k }_{ 2 } }{ \rightleftharpoons } } \) O3 (fast)
Step 2: O3 +O \(\overset { k }{ \longrightarrow } \) 2O2 (slow)
The predicted order of the reaction will be ______.
I
II
III
Zero
11.
In pseudo-order reactions ______.
The actual order of reaction is different from that expected using rate law expression
The concentration of at least one reactant is taken in large excess.
The concentration of reactant taken in excess may be taken as constant
All of these
12.
For the reaction, 2N2O5 ⟶4 NO2+O2, select the correct statement.
Rate of formation of O2 is same as rate of formation of NO2
Rate of disappearance of N2O5 is two times the rate of formation of NO2.
Rate of formation of O2 is 0.5 times rate of disappearance of N2O5
Rate of formation of NO2 is equal to rate of disappearance of N2O5
13.
For a reaction, 2A + B ⟶ 3C, The rate of appearance of C at time 't' is 1.2 x 10-4 mol L-1s-1. Identify the rate of reaction.
4 x 10-5mol L-1s-1
4.5 x 10-1mol L-1s-1
3.6 x 10-4 mol L-1s-1
None of these
14.
What would be the rate of disappearance of oxygen, if the rate of formation of nitric oxide (NO) is 3.6 x 10-3mol L-1 s-1?
4 x 10-3mol L-1s-1
4 x 10-3mol-1 L-1s-1
4.5 x 10-3mol L-1s-1
4.5 x 10-3mol-1 L-1s-1
15.
2N2O5 ⟶ NO2 + O2, \(\frac { d\left[ { N }_{ 2 }{ O }_{ 5 } \right] }{ dt } \) = k1[N2O5], \(\frac { d\left[ { NO }_{ 2 } \right] }{ dt } \)= k2[N2O5] and \(\frac { d{ O }_{ 2 } }{ dt } \) = k 3[N2O5], the relation between k1, k2 and k3 is _____.
2k1 = 4k2 = k3
k1 = k2 = k3
2k1 = k2 = 4k3
2k1 = k2 = k3
1.
(b)
\(\frac { Ea }{ 2.303R } \)
2.
(c)
3.
(b)
Second
4.
(c)
Molecularity of a reaction can be zero
5.
(c)
∆H of reaction
6.
(d)
zero order
7.
(a)
It is a 2 steps reaction, step 1 is slower than step 2
8.
(c)
90 kJ
9.
(d)
None of these
10.
(a)
I
11.
(d)
All of these
12.
(c)
Rate of formation of O2 is 0.5 times rate of disappearance of N2O5
13.
(a)
4 x 10-5mol L-1s-1
14.
(c)
4.5 x 10-3mol L-1s-1
15.
(c)
2k1 = k2 = 4k3
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