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Chemical Kinetics(20-11-2018)


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30 Questions MCQ Test AAKSC Chemistry Mock test Series | Chemical Kinetics(20-11-2018)

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Chemical Kinetics(20-11-2018) - Question 1

In the reaction:A + 2B→ 3C+D ,which of the following expression does not described change in the concentration of various species as a function of time?

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 1

For the given reaction.

Chemical Kinetics(20-11-2018) - Question 2

The accompanying figure depicts the change in  concentration of species X and Y for the reaction , as a function of time. The point of intersection of the two curves represnts.

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 2

The intersection point indicates that half of the reactant X is converted into Y.

Chemical Kinetics(20-11-2018) - Question 3

In a reaction, the rate expression is, rate = K [A] [B] 2/3 [C] 0, the order of reaction is:    

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 3

Order of reaction is sum of  powers raised on concentration terms in order to write rate expression.

Chemical Kinetics(20-11-2018) - Question 4

For a reversible reaction A  B, Ist order in both the directions, the rate of reaction is given by:

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 4

Rate  = K1[A]-K2[B] for a reversible reaction of 1 order opposed by 1 order.

Chemical Kinetics(20-11-2018) - Question 5

Which curve represnts Zero order reaction?

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 5

For zero order reaction 

On intergrating, -[A] = Kt + c

or    y = c + mx

Chemical Kinetics(20-11-2018) - Question 6

For the decomposition of N2O5(g), it is given that:

Activation energy Ea

Activation energy E'a

then:

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 6

Energy of activation does not depend on the stoichiometry of change. It is characteristic value for a chemical      reaction.

Chemical Kinetics(20-11-2018) - Question 7

A reaction, occurs by the following mechanisum :

A⇆ A + A        .......(Slow)

Its order would be:

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 7

rate = K[ A2]

Chemical Kinetics(20-11-2018) - Question 8

The rate of reaction becomes 2 times for every 100C rise in temperature. How the rate of reaction will increase when temperature is increased from 300C to 800C?    

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 8

rate2 = x rate , the rate increases by 25 times, i.e., 32 times. 

Chemical Kinetics(20-11-2018) - Question 9

A drop of solution (volume 0.05 mL) contains 3.0 x 10-6 mole of H+. If the rate constant of disappearance of H+ is 1.0 x 10-7 mol litre-1 sec-1. How long would it take for H+ in drop to disappear?

 

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 9

Since rate constant = 1 x 10-7 mol litre-1 sec-1 
         ∴   Zero order reaction

0.05 mL has 3 x 10-6 mole of H+

 

Chemical Kinetics(20-11-2018) - Question 10

Ethylene is produced by cyclobutane as:

The rate constant is 2.48 x 10-4 sec-1. In what time will the molar ratio of the ethylene to cyclobutane in reaction mixture attain the value equals to unity ?    

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 10

Mole at t = 0    a    0

Mole at t = t    (a-x)    2x

 =1635.2 second = 27.25 minute

Chemical Kinetics(20-11-2018) - Question 11

A reaction takes place in three steps with individual rate constant and activation energy.

Overall rate constant, K = (k1k3/k2)2/3

Overall activation energy of the reaction will be:

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 11


= 2/3 [180 + 80 - 50] = 140KJ/mol

Chemical Kinetics(20-11-2018) - Question 12

In the following first order competing reactions :
A + Reagent ---> Product
B +  Reagent ---> Product
The ratio of K1/K2, if only 50% of B will have been reacted when 94% of A has been reacted in same time is:  

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 12

For 50% B reacted, K2 = (2.303/T2)log100/50

For 94% A reacted, K1 = (2.303/T1)log100/6

K2/K1 = t2/t1x0.3010/1.2218

Since t2 = t1, because 50% B has reacted when 94% A has reacted.

K2/K1 = 0.3010/1.2218 = 0.246 and K1/K2 = 4.06

Chemical Kinetics(20-11-2018) - Question 13

From the following data, the activation energy for the reaction (cal/mol):

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 13


Chemical Kinetics(20-11-2018) - Question 14

    A substance undergoes first order decomposition. The decomposition follows two parallel first order reactions as:

​The percentage distribution of B and C are:

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 14

For parallel path reaction

Chemical Kinetics(20-11-2018) - Question 15

Mathematical expression for t1/4, i.e., when (1/4)th reaction is over following first order kinetics can be given by:

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 15

Chemical Kinetics(20-11-2018) - Question 16

The rateconstant of a second order reaction is 10-2 (Ms)-1. The rate constant expressed in cc. molecule-1 min-1 is:
 

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 16

K = 10-2 mol-1 litre sec-1

Chemical Kinetics(20-11-2018) - Question 17

The rate of disappearance of SO2 in the reaction; 2SO2 + O2 ---> 2SO3 is 1.28 x 10-3 g/sec. The the rate of formation of SO3 is:

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 17

The rate of formation of SO3 is 1.28×10−3g/sec.

Chemical Kinetics(20-11-2018) - Question 18

The rate of a first order reaction is 1.5 x 10-2 M min-1 at 0.5 M concentration of reactant. The half-life of reaction is:    

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 18

Chemical Kinetics(20-11-2018) - Question 19

For a reaction aA -->bB when [A] = 2.2 mM, the rate was found to be 2.4 mMs-1. On reducing concentration of [A] to half , the rate changes to 0.6 mMs-1. The order of reaction with respect to A is:
 

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 19

Chemical Kinetics(20-11-2018) - Question 20

​During the kinetic study of the reaction  following results were obtained. 

On the basis the data, which one is correct?

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 20

Use : r = K [ A ]m [ B ]n

Chemical Kinetics(20-11-2018) - Question 21

The reaction L ---> 4  is started with 10 g of L. After 30 and 90 mintue, 5 g and 1.25 g of L are left respectively. The order of reaction is :    

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 21

The given data suggests that  which is obeyed by first order reaction.

Chemical Kinetics(20-11-2018) - Question 22

The differential rate expression for the reaction H2 + I--> 2HI is:

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 22

follow review of rate of reaction.

Chemical Kinetics(20-11-2018) - Question 23

In a first order reaction the concentration of reactant decreases from 800 mol/dm3 to 50 mol/dm3 in 2 x 104 sec. The rate constant of reaction in sec-1 is:    

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 23

Chemical Kinetics(20-11-2018) - Question 24

Plots showing the variation of the rate constant (k) with temperature (T) are given below. The plot that follows Arrhenius equation is:

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 24

i.e , K =  increase exponentially, with rise in temperature.

Chemical Kinetics(20-11-2018) - Question 25

The rate constants of three reactions involving reactant A only obeying I, II, III order respectively is same. Which of the following is true?​

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 25

r1 = K [ A ]1 ; r2 = K [ A ]2 ; r3 = K [ A ]3

Chemical Kinetics(20-11-2018) - Question 26

loge K vs. 1/T plots shows a straight line having slope of 1200 and intercepts on the Y-axis of 2, then :    

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 26


Chemical Kinetics(20-11-2018) - Question 27

A reaction occurs in three rate detemining steps having rate constant K1, K2 and K3 respectively and arrehenius factor A1, A2, A3 respectively. The overall rate constant . If energy of activations for each step is Ea1, Ea2, and Ea3 respectively, then overall energy of activation is:

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 27


Chemical Kinetics(20-11-2018) - Question 28

At 3 km altitude, water boils at 900C and 300 seconds are taken to cook a ‘3 minute egg’. The temperature coefficient for the process of cooking is:    

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 28

Temperature coefficient

Chemical Kinetics(20-11-2018) - Question 29

Select the incorrect statement:    

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 29

C is the correct answer.

According to Le Chatelier’s principle rate of exothermic reactions decreases with an increase in temperature.

Chemical Kinetics(20-11-2018) - Question 30

The rate expression for a reaction is  (α and β > 0). The half life of the reaction can be given by:

Detailed Solution for Chemical Kinetics(20-11-2018) - Question 30







 

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