Question # 1

The rate of reaction

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Increase as the reaction proceeds

Decreases as the reaction proceeds

Remains the same as the reactions proceeds

May decrease or increase as the reaction proceeds

Chemical reactivity of different substance is controlled by

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Atomic number

Electronic arrangement

Mass number

Number of isotope of reactant elements

Which properties of liquid is measured by polarimeter

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Conductance

Refractive index

Optical activity

Change in volume

Which technique is used ot determine the absorption of radiations.

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Spectrometry

dilatometer method

Refractometric method

Optical rotation method

After 3 half life of a chemical reaction, amount of reactant un reactive will be.

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50%

25%

12.5%

6.25%

The unit of rate constant is the same as that of the rate of reaction is.

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

A substance which itself is not a catalyst but increases the activity of a catalyst is called.

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Promoter

Poisoner

Inhibitor

Enzyme

When a reaction proceeds in a sequence of steps, the overall rate is determined by

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Fastest step

Slowest step

Order of different steps

Molecularity of all steps

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

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First order reaction

Second order reaction

Zero order reaction

Third order reaction

The power of which the concentration of a substance appears in the rate expression is known as

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order of reaction with respect to that substance

Rate of reaction

Order of reaction

Molecularity of reaction

The influence of temperature on reaction rate is predicated by

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Free energy change of reaction

Arrhenius equation

Van der weal's equation

Kinetic equation

When a chemical reaction is completed.

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Instantaneous rate > average rate

Instantaneous rate = average rate

Instantaneous rate is zero

Both average and instantaneous rates become zero

Half -Life period of a first order reacting is independent of.

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Initial concentration of the compound

Conditions of temperature

Presence of catalyst

All the above

Which one of the following statements is incorrect.

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Enzymes are protein in nature

Enzymes are catalyst

Enzymes can catalyze any reaction

Urease is an enzyme

With increases of 10 oC temperature the rate of reaction doubles. This increase in rate of reactions is due to.

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Decrease in activation energy of reaction

Decrease in the number of collisions between reactant molecules

Increase in activation energy of reactants

Increase in number of effective collisions

Dilatometer method is useful for the reactions that involve.

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Ionic species

Where reactant absorb U.V. visible or infrared radiations

Small volume changes in solutions

Change in refractive indices

A substance which rerareds the rate of a reaction is called

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Inhibitor

Activator

Auto-catalyst

None of these

The substance which decrease the activity of a catalyst is called.

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Promoter

Activator

Inhibitor

Positive catalyst

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