Test: Rate Law, Molecularity & Order Of Reaction


20 Questions MCQ Test Chemistry Class 12 | Test: Rate Law, Molecularity & Order Of Reaction


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This mock test of Test: Rate Law, Molecularity & Order Of Reaction for Class 12 helps you for every Class 12 entrance exam. This contains 20 Multiple Choice Questions for Class 12 Test: Rate Law, Molecularity & Order Of Reaction (mcq) to study with solutions a complete question bank. The solved questions answers in this Test: Rate Law, Molecularity & Order Of Reaction quiz give you a good mix of easy questions and tough questions. Class 12 students definitely take this Test: Rate Law, Molecularity & Order Of Reaction exercise for a better result in the exam. You can find other Test: Rate Law, Molecularity & Order Of Reaction extra questions, long questions & short questions for Class 12 on EduRev as well by searching above.
QUESTION: 1

Direction (Q. Nos. 1-13) This section contains multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct

Q. In the following reaction, which has maximum rate w.r.t. rate of disappearance of NH3?

4NH3 + 50  4NO + 6H2O

Solution:

By stoichiometry of the reaction

 

similarly,

QUESTION: 2

The rate of formation of NO(g) in the reaction, 2NOBr(g) → 2NO(g) + Br2(g) was reported as 1.6 x 10-4 Ms-1. Thus, rate of the reaction is 

Solution:

QUESTION: 3

Rate of formation of SO3 in the following reaction:

2SO2 + O2 → 2SO3

is 100 kg min-1. Hence, rate of disappearance of SO2 will be

Solution:

Rate of disappearance of SO2 = Rate of formation of SO3 But quantity is to be expressed in terms of moles.
Rate of formation of SO3 = 100 kg SO3 min-1 

QUESTION: 4

Following reaction can take place in both directions

For the forward reaction, rate varies with concentration of A as and for the backward reaction 

Hence, net reaction rate is

Solution:

QUESTION: 5

For a reaction, xA → yB, rate of disappearance of ‘A’ is related to the rate of appearance of 'B' by the equation 

Thus, x and y respectively are

Solution:

Correct Answer : c

Explanation : = -1/x d[A]/dt = 1/y d[B]/dt

=> -d[A]/dt = x/y d[B]/dt = 1/4 d[B]/dt

By the hit and trial method 

we get, x = 1/2 y = 2

QUESTION: 6

For the reaction,

H2(g) + A2(g)  2H(g) + A2(g)

kf = 2.2 x 104 L mol-1s-1 and Kc = 1.00 x 10-4 at 3000 K. Thus, kb is 

Solution:

QUESTION: 7

For a reaction,

 

hen x, y and z are 

Solution:

The correct answer is option C
For the reaction: xA+yBzC

Given that,

Multiplying equation 2 by 1/3, we get

On comparing equation 1 and 3, we get value of
x=3, y=3, z=2.
 

QUESTION: 8

For the reaction,

2N2O5(g) → 4NO2 (g) + O2(G)

Thus,

Solution:

QUESTION: 9

The decomposition of acetaldehyde is given by the following reaction:

CH3CHO(g) → CH4(g) + CO(g)

Rate of the reaction with respect to the pressure of the reactant is 

Solution:

QUESTION: 10

For the reaction, 

 then rate law is

Solution:

QUESTION: 11

For gaseous reaction, the rate can be expressed as

Solution:





QUESTION: 12

The initial rates of reaction for the equation, 2A + B → Products.

Products were determined under various initial concentrations of reactants.

Thus, rate law is equal to

Solution:

Let order w.r.t. A = a, order w.r.t. B = b


QUESTION: 13

For the reaction, A + 2B → Product, the reaction rate was halved on doubling the concentration of A. Thus, order w.r.t. A is

Solution:

If concentration of the nth order reaction is made m time, rate becomes mn times.


QUESTION: 14

Direction (Q. Nos. 14 and 15) This section contains a passage describing theory, experiments, data, etc. Two questions related to the paragraph have been given. Each question has only one correct answer out of the given 4 options (a), (b), (c) and (d)

Passage 

The decomposition of NO2 at 400 K proceeds at a of rate of 5.4 x 10 -5 mol L-1 s-1 when [NO2] = 0.01 mol-1

2 NO2(g) → 2NO(g ) + O2(g).

Q. What is the rate law when observed rate is 1.35 x 10-5 mol L-1 s-1 at [NO2] = 0.005 mol L-1?

Solution:

The correct answer is Option D.
 
General formula is,
mol n-1 Ln-1 s -1
But given is,
mol L-1 s-1
If we equate the process we get,
    1-n = 1                           n-1 = -1       
     n = 0                             n = 0

Hence, it is a zero order reaction.
 

QUESTION: 15

The decomposition of NO2 at 400 K proceeds at a of rate of 5.4 x 10 -5 mol L-1 s-1 when [NO2] = 0.01 mol-1

2 NO2(g) → 2NO(g ) + O2(g).

Q. Rate constant of the reaction will be 

Solution:


QUESTION: 16

Direction (Q. Nos. 16-18) This section contains 3 questions. When worked out will result in one integer from 0 to 9 (both inclusive)

In the following reaction

Q. Where negative sign indicates rate of disappearance of the reactant. What is the value of x/y ?

Solution:




QUESTION: 17

The reaction rate is defined as the rate at which the concentration of the reactants __________ with time or the concentration of products ___________ with time.

Solution:

The reaction rate is defined as the rate at which the concentration of the reactants decreases with time or the concentration of products increases with time.

QUESTION: 18

In a certain polluted atmosphere containing O3 at a steady concentration of 2.0 x 10-6 M, the hourly production of O3 by all sources was estimated as 7.2 x 10-15 M. If the only mechanism for destruction of O3 in the second-order reaction is

2O3 → 3O2

then rate constant for destruction reaction, defined by the rate law for - Δ[O3]/Δf is x * 10-7 M-1 s-1 . What is the value of x?

Solution:



QUESTION: 19

Only One Option Correct Type

This section contains 2 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONLY ONE is correct

For a reversible reaction, net rate is 

hence given reaction is 

Solution:

Correct Answer :- b

Explanation :  2A - B --->(reversible) C

For a forward reaction, (dx/dt)f = k1[A]2 [B]-1

For a backward reaction, (dx/dt)b = k2[C]

Net rate = (dx/dt)f - (dx/dt)b

k1[A]2 [B]-1 - k2[C]

QUESTION: 20

Reaction kinetics deals with the study of

Solution:

Reaction kinetics deals with the study of rate of reaction, their mechanism and the factors which affects the rate of reaction. It specifies all the general characteristics of a chemical reaction.

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