ECAT Pre Engineering Chemistry Chapter 11 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 11 Reaction Kinetics

Try The MCQ's Test For ECAT Chemistry Chapter 11 Reaction Kinetics

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ECAT Chemistry Chapter 11 Reaction Kinetics

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Question # 1

The catalytic activity of Pt is much higher when

Question # 2

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Question # 3

For a chemical reaction to take place the particles must have sufficient energy for the effective collisions, the energy is called

Question # 4

In the hydrolysis of CH3COOC2H5the acid produced is

Question # 5

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Question # 6

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Question # 7

To determine the rate of reaction chemically a graphical method is applied. A graph is plotted between the amount or reactant decomposed or product formed against the time. The rate dx/dtat any time is equal to

Question # 8

In an experiment the concentration of a reactant 'A' is doubled the rate increases four times. If concentration in tripled, then rate increases nint times. Thus the rate is proportional to ______ of concentration of 'A'

Question # 9

Hydrogenation of vegetable oils is accelerated by Ni catalyst. The catalytic activity of Bi is increased by a promoter of activator which is

Question # 10

The rate of reaction between two specific time intervals is called

Question # 11

When we perform the same reaction by taking two different initial concentrations of a reactant for a second order reaction then

Question # 12

The unit of rate constant K ismole-1 dm3for a chemical reaction, the order of reaction is :

Question # 13

The rate of reaction is denoted by

Question # 14

The unit of rate constant is the same as that of the rate of reaction in :

Question # 15

Dilatometer method is useful for the reaction that involve :

Question # 16

Which of the following will affect the rate :

Question # 17

The unit of rate constant k is the same as that of the rate of reaction in

Question # 18

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Question # 19

A white precipitate ofsilver chlorideimmediately formed on additionof :

Question # 20

The unit of rate of reaction is

Question # 21

The addition of a catalyst to a reaction changes the

Question # 22

It rate law of an equation is written asdx/dt=K[A][B] ?

Question # 23

Half life period of N2O5is 24 minutes and it remains same where we increase or decrease its initial concentration, then reactions

Question # 24

The rate of reaction :

Question # 25

The value of activation energy Ea of a reaction can be determined from the value of slope of the straight line obtained by plotting a graph between 1/T and log k. the value of Ea is equal to

Question # 26

The factor which effect the rate of reaction

Question # 27

In the reaction of oxalic acid with KMnO4and H2SO4is slow at the beginning but after sometimes the reaction becomes faster due to

Question # 28

In exothermic reaction decrease in potential energy of the products will result in

Question # 29

The rate of reaction :

Question # 30

The rate equation for a reaction is Rate =k[A]. what are unit of K ?

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Sr. # Question Answer
1 The reaction rate is expressed in the units of

A. mol dm-3S-

B. mol dm-3

C.mol dm-3N-

D. dm-3S-

2 Hydrogenation of vegetable oils is accelerated by Ni catalyst. The catalytic activity of Bi is increased by a promoter of activator which is

A. Na and K

B. Na and Hg

C.Hg and Zn

D. Cu and Te

3 The effective activity of a metal catalyst is increased if it is in

A. Solid form

B. Liquid state

C.Gaseous state

D. Finely divided form

4 The experimental relationship between a reaction rate and the concentration of reactants is called

A. Order or reaction

B. Rate law

C.Activated complex

D. Molecularity

5
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A. First order

B. Pseudo first order

C.Second order

D. Zero order

6 Refrectrometric method is used when

A. Reactions involving absorption of I.R. or U. V

B. Reactions involving change of refractive index

C.Reactions involving ions

D. Change of optical activity

7
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8 The unit rate of constan K ismole-1 dm3S-1for a chemical reaction, the order of reaction is :

A. 3

B. 2

C.1

D. 0

9 The rate of reaction determined at a given time is called

A. Average rate

B. Instantaneous rate

C.Specific rate

D. Overall rate

10 If the rate of decay of radioactive isotope decreases from 200 cpm to 25 cpm after 24 hours, what is its half life :

A. 8 hours

B. 6 hours

C.4 hours

D. 3 hours

11 Which of the following may affect the rate constant (k) fro a reaction :

A. Change in concentration.

B. Change in pressure.

C.Change in pH.

D. Change in temperature.

12 Dilatometer method is useful for the reaction that involve :

A. Small volume changes in solutions

B. Change in infractive indices

C.Where reactants absorb U.V, visible or infrared radiation

13 The sum of the exponents of the conc. terms in the rate equation is called

A. Rate of reaction

B. Order of reaction

C.Specific rate constant

D. Average rate

14 Hydrolysis of ethyl-acetate (ester) has order of reaction :

A. 3

B. 2

C.1

D. 1

15 Which statement about Arrhenius equation is incorrect

A. Factor 'A' called Arrhenius constant depends upon collision frequency of reactants

B. Rate of reaction increase by increasing temperature

C.Rate constant k is increased

D. Activation energy Ea is decreased by rise in temperature

16 The actual number of atoms or molecules taking part in rate determining step is

A. Rate of reaction

B. Velocity of reaction

C.Order of reaction

D. Molecularly

17 To determine the rate of reaction chemically a graphical method is applied. A graph is plotted between the amount or reactant decomposed or product formed against the time. The rate dx/dtat any time is equal to

A. k

B. Tangentθ

C.1/a, a is initial conc.

D. 1/a2

18 which one of the following is a heteroheneous catalysis
19 ______ are called biocatalysts

A. Organic acids

B. Organic bases

C.Enzymes

D. All

20 Which of the following is not affected by light
21 If a reactant or product of a reaction absorbs radiation, then physical method for determining the rate of reaction is

A. Spectrometry

B. Refractometry

C.Conductivity measurement

D. Optical method

22

A white precipitate ofsilver chlorideimmediately formed on additionof :

A. Silver nitrate solution to sodium chloride solution.

B. Silver chloride solution to sodium nitrate solution.

C.Silver nitrate solution to potassium chloride solution

D. Silver nitrate solution to hydrogen chloride solution.

23 A catalyst is a substance which increase the rate of a chemical reaction, but remains unchanged at the end of reaction, nut remains unchanged at the end of reaction, because

A. It increases the temperature

B. It increase the surface area

C.It increases the rate constant

D. It decrease the energy energy of activation

24 In the hydrolysis of CH3COOC2H5the acid produced is

A. Inhibitor

B. Catalyst

C.Auto catalyst

D. None of above

25 When the rate of reaction is entirely independent of the conc. of reaction molecules then order of reaction is

A. Zero

B. First

C.Second

D. Third

26 In thermal decomposition of N2O the half life period for two different initial concentrations of N2O are
(i) 255 second for initial N2O 290 mm Hg
(ii) 212 second for initial N2O 360 mm Hg then it is

A. Zero order

B. First order

C.Second order

D. Third order

27 Half life period of a reaction is inversely proportion to the initial concentration of the reactant, then order of reaction is

A. Third order

B. Second order

C.Fist order

D. Zero order

28 By the use of catalysis the energy of activation is

A. Decreased

B. Increased

C.Not affected

D. None

29 Homogenous catalysis is that in which catalyst and reactants are in same phase. Which one of the following reaction is a homogenous catalysis
30 The rate of reaction is denoted by

A. dc/dp

B. dc/ac

C.dc/dT

D. dc/dt

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