Question # 1

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

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

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.

If the rate of decay of radioactive isotope decreases from 200 cpm to 25 cpm after 24 hours, what is its half life :

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8 hours

6 hours

4 hours

3 hours

In zero order reaction, the rate is independent of :

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Temperature of reaction

Concentration ofreactants

Concentration of products

None of these.

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Diastase

Lipase

Inverters

Zymase

A catalyst is a substance which increase the rate of a chemical reaction, but remains unchanged at the end of reaction, nut remains unchanged at the end of reaction, because

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It increases the temperature

It increase the surface area

It increases the rate constant

It decrease the energy energy of activation

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

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2

3

4

9

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.

Which of the following factors does not influenced the rate of reaction

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Concentration of the reaction

Nature of the reactants

Molecularity of the reaction

Temperature

It rate law of an equation is written asdx/dt=K[A][B] ?

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Reaction is independent of the concentration of A and B.

Product is decreasing with passage of time.

Reactant in increasing with passage of time.

Reactant is increasing with passage of time.

The unit of rate of reaction is

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mole dm^-3

mole Kg^-1

moles dm^-3sec^-1

grams dm^-3

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

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3

2

1

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.

The rate determining step is the :

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Slowest step.

Fastest step.

Moderate step.

Both (a) and (b).

For a chemical reaction to take place the particles must have sufficient energy for the effective collisions, the energy is called

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Average energy

Activation energy

Potential energy

Collision energy

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

With the progressive of the reaction the slope of the curve between concentration of product and time

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Gradually becomes more steep

Gradually becomes less steep

No change occurs in slope

None of these occurs

______ are called biocatalysts

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Organic acids

Organic bases

Enzymes

All

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

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

In the hydrolysis of CH₃COOC₂H₅the acid produced is

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Inhibitor

Catalyst

Auto catalyst

None of above

If the rate of reaction is independent of the concentration of the reactant, the reaction is of

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Zero order

First order

Second order

Third order

The experimental relationship between a reaction rate and the concentration of reactants is called

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Order or reaction

Rate law

Activated complex

Molecularity

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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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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Measuring pH

Measuring density

Titration against standard NaOH

Titration against standard KMnO₄solution

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Homogeneous

Heterogeneous

Isogeneous

None

Which of the following will affect the rate :

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First step of reaction.

Last step of reaction.

Rate determining step.

Fastest step.

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