Question # 1

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

Unit of rate constant is the same as that of the rate of reaction in

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Zero order reaction

1st order reaction

2nd order reaction

3rd order reaction

When a reaction occurs in many steps than the slowest step is.

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Mechanism step

Rate determining step

enthalpy determining step

None of the above

If reactants have very low activation energy it means that reaction is.

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Slow

Fast

Endothermic

Exothermic

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%

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1

2

3

None of these

Half life period for 235 U is

92

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710 million years

810 milion years

720 million years

820 million years

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

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

After 3 half lives of a chemical reaction, the % fraction of the amount left is

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6.25

75

12.5

50

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

Which technique is used ot determine the absorption of radiations.

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Spectrometry

dilatometer method

Refractometric method

Optical rotation method

a zero order reaction is one is which

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Reactants do not react

One reactant is in large excess

Concentration of reactant do not change with passage of time

Rate is of affected by changing concentration of reactants

The mathematical relation between the rate of reaction and the concentrations of the reactants is known as the

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Rate equation

Rate law

Arrhenius equation

Both a and b

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

the rate of reaction when concentration of reactants are taken unity is called.

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Average rate

Instantaneous rate

Specific rate

Rate equation

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

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