Question # 1

The rate of reaction :

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Decreases as the reaction proceeds

Increases as the reaction proceeds

May decrease or increase reaction proceeds

Remains same as the reaction proceeds

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

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

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3

2

1

Refrectrometric method is used when

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

Reactions involving change of refractive index

Reactions involving ions

Change of optical activity

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

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Slope

1/Slope

Slope x R

Slope x 2.303 R

In the hydrolysis of CH₃COOC₂H₅the acid produced is

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Inhibitor

Catalyst

Auto catalyst

None of above

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

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The order of reaction

The speed of reaction

The specific rate constant

The overall order of reaction

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

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

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Reaction becomes exothermic

Energy of activation is different

Mechanism of reaction is changed

Half life period is changed

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Homogeneous

Heterogeneous

Isogeneous

None

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

The rate determining step is the :

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Slowest step.

Fastest step.

Moderate step.

Both (a) and (b).

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.

A zero order reaction is one in which :

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Rate is not affected by changing concentration of reactants.

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

Reactants do not react.

One reactants in large excess.

Which technique is used to determine the absorption of radiations?

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Dilatometer method

Optical rotation method

Spectrometry

Refractometric method

A white precipitate ofsilver chlorideimmediately formed on additionof :

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Silver nitrate solution to sodium chloride solution.

Silver chloride solution to sodium nitrate solution.

Silver nitrate solution to potassium chloride solution

Silver nitrate solution to hydrogen chloride solution.

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

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

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Instantaneous rate of reaction.

Average rate of reaction.

Rate of a reaction.

Minimum rate of a reaction.

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

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Rate of reaction

Velocity of reaction

Order of reaction

Molecularly

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

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

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Order of reaction can determined by an experiment

Order of reaction can determined from a balance equation only.

Order of reaction can determined increases by increasing temperate.

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

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

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First order reaction

Second order reaction

Third order reaction

Zero order reaction

Which of the following is not affected by light

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which one of the following is a heteroheneous catalysis

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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

Which of the following reactions occur at moderate rate :

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Rusting of iron

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

Hydrolysis of an ester

Fermentation of sugars

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

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Rate constant.

Rate of reaction.

Rate equation.

Rate law.

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

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The rate of reaction :

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Increase as the reaction proceeds.

Decreases as the reaction proceeds.

Remains the same as the reaction proceed.

May decrease or increase as the reaction proceeds.

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

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Decrease in activation energy or reaction.

Decrease in number of collisions between reactant molecules.

Increase in activation energy of reactants.

Increase in number of effective collisions

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

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Mole-1 dm³ S^-1

Mole dm³ S^-1

Moledm³

S^-1

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