Question # 1

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

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3

2

1

With increases in temperature of 10 K of the reacting gases the rate of reaction is doubled because

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Increase in number of collisions

Number of molecules having energy more than Ea is doubled

Increase in order of reaction

Increase in surface area

Dilatometric method is used for rate determination when

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Reactions involving change of optical

Reactions involving change of optical activity

Reactions involving small volume change

None of above

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

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Spectrometry

Refractometry

Conductivity measurement

Optical method

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

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Presence of catalyst.

Conditions of temperature

Initial concentration of the compound

All of above

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

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The product

The activated complex

Both a and b

None of these

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Zero

1

2

1.5

The rate of reaction determined at a given time is called

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Average rate

Instantaneous rate

Specific rate

Overall rate

A pseudo uni-molecular reaction has order of reaction :

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3

2

1

0

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

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Zero order

First order

Second order

Third order

Dilatometer method is useful for the reaction that involve :

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Small volume changes in solutions

Change in infractive indices

Where reactants absorb U.V, visible or infrared radiation

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Three times

Six times

Nine times

Two times

Rate of chemical reaction depends upon :

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The number of total collisions per second.

Number of molecules taking part in a chemical reaction.

Number of fruitful collisions per second

Number of fruitless collisions per second.

Decreases om concentration of reactant is denoted by

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dc/dt

-dc/dt

+dc/dt

None

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

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Zero

First

Second

Third

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Rate is independent of concentration of water since it is in excess

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

Rate depends upon the concentration of acid catalyst added

Rate = k[CH₃COOC₂H₅]^1/2[H₂O]^1/2

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

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Time

Temperature

Concentration of reactants

Order of reaction

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Initial concentration of reaction

Initial concentration of products

Final concentration of products

Order of the reaction

The addition of a catalyst to a reaction changes the

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Enthalpy

Entropy

Nature of reactants

Energy of activation

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

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Decreases in kinetic energy of the particles

Increases in kinetic energy of the particles

No change in kinetic energy

Decreases in activation energy

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

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Change in concentration.

Change in pressure.

Change in pH.

Change in temperature.

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Rate = k[FeCl₃] [Kl]²

Rate = k[Fe⁺³][Cl^-1] [Kl]

Rate = k[Fe⁺³] [Cl^-1][K;]

Rate = k[Kl]³[FeCl₃]°

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

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l_Aelements are more soft then ll_A

l_Aelements are non-metals

l_Aelements have 1 electron in their outermost s-orbital and are strongly electropositive

l_Aelements make ionic bond

Which statement about Arrhenius equation is incorrect

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

Rate of reaction increase by increasing temperature

Rate constant k is increased

Activation energy Ea is decreased by rise in temperature

It is common observation that rates of chemical reactions differ :

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Greatly.

A little bit.

Moderately.

The catalytic activity of Pt is much higher when

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It is mixed with asbestos

It is mixed with Pd

It is mixed with arsenic

In is made colloidal platinum

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

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An autocatalyst

A catalyst

A negative catalyst

All of these

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 :

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1

2

3

Above

Factor which slows down the rate of reaction is

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Small size of the particles of the reactant

High temperature of reaction

More concentration of reactant

Lowering the temperature

Which statement is true about order of reaction :

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Order of reaction can only be determined by an experiment.

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

Order of reaction increase by increasing temperature.

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

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