Question # 1

Which of the following reactions are usually slow?

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Neutralization of acids and bases

Displacement Reactions

Organic substitution reaction

Free radical reactions

The radioactive disintegration of 238U92 is

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First order

Second order

Third order

Zero order

Rate of which reaction increases with temperature?

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Exothermic and endothermic reactions

Endothermic reactions

Exothermic reactions

None of these

The concentration of product is increasing from 30 mole/dm3 to 40mol/dm3 in 0.5 sec then rate of reaction will be------moledm-3sec-1

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0

20

15

25

In which of the following techniques rate of reaction is directly related with number ofions

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Spectrometry

Dilatometric method

Conductometric method

Refractometric method

Reaction kinetics is important to discover the---under which reaction will proceed most economically:

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rate constant

Conditions

volume

equilibrium point

The number of reacting molecules whose concentration change during reaction is called

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Activated molecule

Rate of reaction

Order of reaction

half-life

Spectrometry method is applicable if a reactant or a product absorbs radiation

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Ultraviolet

Visible

Infrared

Any of these

Doubling the pressure in a liquid phase reaction

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Will double the rex

Will increase the rex

Will decrease the rex

Will not alter the concentration of reactant

Substance which is formed as well as consumed during a chemical reaction and have temporary existence.

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Reactant

product

Catalyst

Intermediate

Rusting of iron is the example of

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Fast

Slow

moderate

depends upon conditions

Amount of product formed increases with time, this statement is true for reactions-------with kinetics

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1s order

3rd order

zero order

Any order

The study of which one of the followings guides to the mechanism of the reaction

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Order of reaction

Rate of reaction

Half-life period of reaction

Rate determining step

Half-lives required to convert 100% reactant to produet for a first order reaction are

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10

1000

100

Infinity

Higher the surface area available for reaction

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slower the reaction

faster the reaction

constant the reaction

lower the Ea

When the concentration of product is increased the instantaneous rate of reaction with reference to reactants will be

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Positive

Negative

the same

falling curve

When does average rate become equal to instantaneous rate of reaction

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At the start of reaction

time interval is zero

at the end of reactior

time interval approaches zero

The conversion of molecules of A to B follows a second order kineties. Doubling the concentration of A will inerease the rate of formation of B by a factor of

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2

4

1/2

1/4

The reaction takes place among the molecules when they have:

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Activation energy

Properly oriented

Concentrated

Activation energy and proper orientation

For reaction of methane and chlorine light is not available then

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Reaction will take place rapidly

No Reaction take place

Reaction occurs at double the rate

May all cases occur

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