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

Question # 2

Which technique is used to determine the absorption of radiations?

Question # 3

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

Question # 4

Which of the following is not affected by light

Question # 5

Refrectrometric method is used when

Question # 6

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Question # 7

The unit of rate of reaction is

Question # 8

For effective collisions the molecules slow down before collision and their kinetic energy decreases which results in increase in their

Question # 9

Platinum is poisoned by

Question # 10

A substance which increases the rate of a reaction without being consumed during the reaction is called

Question # 11

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

Question # 12

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

Question # 13

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Question # 14

The chemical method used for determination of rate of reaction is

Question # 15

If the rate equation of a reaction 2A+B-------->Products is , Rate = K[A] [B], and A is present in large excess, then order of reaction is :

Question # 16

Rate of chemical reaction depends upon :

Question # 17

The rate of reaction :

Question # 18

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Question # 19

In the hydrolysis of CH3COOC2H5the acid produced is

Question # 20

Factor which slows down the rate of reaction is

Question # 21

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Question # 22

If a reactant or product of a reaction absorbs radiation, then physical method for determining the rate of reaction is

Question # 23

Complex protein molecules which catalyses the organic reactions in the living cells are called

Question # 24

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

Question # 25

With increases of 10°C temperature the rate of reactiondoubles. This increase in rate of reactionis due to :

Question # 26

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

Question # 27

Group l-A elements react with water fastly than the reaction of group ll-A elements because

Question # 28

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

Question # 29

The change in concentration of reactant or product per unit time is called :

Question # 30

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Sr. # Question Answer
1
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A. 2

B. 3

C.4

D. 9

2 The rate of reaction :

A. Increase as the reaction proceeds.

B. Decreases as the reaction proceeds.

C.Remains the same as the reaction proceed.

D. May decrease or increase as the reaction proceeds.

3
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A. Small change in concentration of product

B. Small time internal

C.Co-efficient of the reactant

D. Co-efficient of the product

4 A zero order reaction is one in which :

A. Rate is not affected by changing concentration of reactants.

B. concentration of reactants do not change with the passage of time.

C.Reactants do not react.

D. One reactants in large excess.

5 In the hydrolysis of CH3COOC2H5the acid produced is

A. Inhibitor

B. Catalyst

C.Auto catalyst

D. None of above

6 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

7 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

A. Slope

B. 1/Slope

C.Slope x R

D. Slope x 2.303 R

8 The number of atoms or molecules whose concentrations determine the rate of the reaction is called

A. Molecularity

B. Order

C.Rate of reaction

D. Rate constant

9
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A. Three times

B. Six times

C.Nine times

D. Two times

10 The rate of reaction between two specific time intervals is called

A. Instantaneous rate

B. Average rate

C.Specific rate

D. Ordinary rate

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

A. Reaction is independent of the concentration of A and B.

B. Product is decreasing with passage of time.

C.Reactant in increasing with passage of time.

D. Reactant is increasing with passage of time.

12
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A. Rate is independent of concentration of water since it is in excess

B. Rate is independent of concentration of ester since it is in exces

C.Rate depends upon the concentration of acid catalyst added

D. Rate = k[CH3COOC2H5]1/2[H2O]1/2

13 The factor which effect the rate of reaction

A. Nature of reactants

B. Surface area

C.Light

D. All of the above

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

A. First order reaction

B. Second order reaction

C.Third order reaction

D. Zero order reaction

15 Rate law of an equation is obtained :

A. From a balance equation.

B. Can be calculated theoretically as well as determined experimentally.

C.It is only calculated theoretically.

D. Experimentally.

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

A. Average rate

B. Instantaneous rate

C.Specific rate

D. Overall rate

17 The example of a photo chemical reaction is photosynthesis has order of reaction :

A. 1

B. 2

C.0

D. 3

18 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

19 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

20
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21 The rate of reaction determined at a given time is called

A. Average rate

B. Instantaneous rate

C.Specific rate

D. Overall rate

22 The reaction rate is expressed in the units of

A. mol dm-3S-

B. mol dm-3

C.mol dm-3N-

D. dm-3S-

23 When initial concentration of reactants an order of reaction is given, then its half life period can be calculated by the equation
24 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

25
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A. Diastase

B. Lipase

C.Inverters

D. Zymase

26 Group l-A elements react with water fastly than the reaction of group ll-A elements because

A. lAelements are more soft then llA

B. lAelements are non-metals

C.lAelements have 1 electron in their outermost s-orbital and are strongly electropositive

D. lAelements make ionic bond

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

A. Order of reaction can determined by an experiment

B. Order of reaction can determined from a balance equation only.

C.Order of reaction can determined increases by increasing temperate.

D. Order of reaction must be in whole number and not in fraction.

28 When copper is allowed to react with HNO3, the reaction is slow in the beginning, finally becomes very fast. It is due to the formation of an auto catalyst which is

A. Cu(NO3)2

B. CuO

C.O2

D. HNO2

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

A. Third order reaction

B. Second order reaction

C.First order reaction

D. Zero order reaction

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

A. Reaction becomes exothermic

B. Energy of activation is different

C.Mechanism of reaction is changed

D. Half life period is changed

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