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

Rate of chemical reaction depends upon :

Question # 2

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 # 3

Refrectrometric method is used when

Question # 4

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Question # 5

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

Question # 6

The rate of reaction :

Question # 7

Decreases om concentration of reactant is denoted by

Question # 8

The rate of reaction :

Question # 9

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Question # 10

A white precipitate ofsilver chlorideimmediately formed on additionof :

Question # 11

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 # 12

Activation energy is the difference of energy between the energy of the reactant and

Question # 13

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

Question # 14

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 # 15

Which of the following is not affected by light

Question # 16

The rate of reaction b/w two specific time intervals is called :

Question # 17

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

Question # 18

Which of the following will affect the rate :

Question # 19

In the manufacture of NH3by Haber's process catalyst used is iron its catalytic efficiency is poisoned by

Question # 20

A zero order reaction is one in which :

Question # 21

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Question # 22

With the progressive of the reaction the slope of the curve between concentration of product and time

Question # 23

Half life period of a first order reaction is independent of:

Question # 24

Value of rate constant k is specific for a reaction, and varies from reaction to reaction. The value of k of a reaction changes with

Question # 25

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

Question # 26

Platinum is poisoned by

Question # 27

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

Question # 28

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Question # 29

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

Question # 30

In the hydrolysis of CH3COOC2H5the acid produced is

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Sr. # Question Answer
1

Which technique is used to determine the absorption of radiations?

A.

Dilatometer method

B.

Optical rotation method

C.

Spectrometry

D.

Refractometric method

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

A.

Mole-1 dm3 S-1

B.

Mole dm3 S-1

C.

Mole dm3

D.

S-1

4 The rate constant k of a reaction activation energy Ea and temperature are related by Arrhenius in the form of an equation which is
5 In the rate equation when the concentration of reactants are unity, then rate is equal to

A. Instantaneous rate

B. Average rate

C.Active mass of products

D. Specific rate constant

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 The rate of reaction between two specific time intervals is called

A. Instantaneous rate

B. Average rate

C.Specific rate

D. Ordinary rate

8 When initial concentration of reactants an order of reaction is given, then its half life period can be calculated by the equation
9 Which statement is true about order of reaction :

A. Order of reaction can only be determined by an experiment.

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

C.Order of reaction increase by increasing temperature.

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

10 In zero order reaction, the rate is independent of :

A. Temperature of reaction

B. Concentration ofreactants

C.Concentration of products

D. None of these.

11 All reactions occur in :

A. A single step.

B. A series of steps

C.Two steps.

D. Both (a) and (b)

12 In the expression rate = K [A]a[B]bK is

A. The order of reaction

B. The speed of reaction

C.The specific rate constant

D. The overall order of reaction

13 Optical rotation method is sued when

A. Reaction involve ions

B. Change of refractive indices

C.Reactions involving change of optical activity

D. None of the above

14 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

15
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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

16 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

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

A. Average rate

B. Instantaneous rate

C.Specific rate

D. Overall rate

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

A. First order reaction.

B. Second order reaction.

C.Zero order reaction.

D. Third order reaction.

19 Which statement is not correct

A. Enzymes catalyst a specific reaction

B. Enzymes show catalytic activity at a specific temperature

C.The catalytic activity of enzymes is stopped if optimum pH is changed

D. The catalytic activity is poisoned by a co-enzymes

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

A. Average energy

B. Activation energy

C.Potential energy

D. Collision energy

21
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A. Initial concentration of reaction

B. Initial concentration of products

C.Final concentration of products

D. Order of the reaction

22 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

23 In the hydrolysis of CH3COOC2H5the acid produced is

A. Inhibitor

B. Catalyst

C.Auto catalyst

D. None of above

24 Homogenous catalysis is that in which catalyst and reactants are in same phase. Which one of the following reaction is a homogenous catalysis
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

A. Slope

B. 1/Slope

C.Slope x R

D. Slope x 2.303 R

26 It is common observation that rates of chemical reactions differ :

A. Greatly.

B. A little bit.

C.Moderately.

27
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A. Diastase

B. Lipase

C.Inverters

D. Zymase

28
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A. 1st order

B. 2nd order

C.Zero order

D. 3rd order

29 Which of the following reactions occur at moderate rate :

A. Rusting of iron

B. Chemical weathering of stone work of buildings by acidic gases in atmosphere.

C.Hydrolysis of an ester

D. Fermentation of sugars

30 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

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