Question # 1

The rate of reaction determined at a given time is called

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Average rate

Instantaneous rate

Specific rate

Overall rate

In the rate equation when the concentration of reactants are unity, then rate is equal to

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Instantaneous rate

Average rate

Active mass of products

Specific rate constant

It is common observation that rates of chemical reactions differ :

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Greatly.

A little bit.

Moderately.

For effective collisions the molecules slow down before collision and their kinetic energy decreases which results in increase in their

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Activation energy

Average energy

Potential energy

Collisions frequency

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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Three times

Six times

Nine times

Two times

In thermal decomposition of N₂O the half life period for two different initial concentrations of N₂O are

(i) 255 second for initial N₂O 290 mm Hg

(ii) 212 second for initial N₂O 360 mm Hg then it is

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Zero order

First order

Second order

Third order

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

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 chemical method used for determination of rate of reaction is

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Spectroscopic

Conductiometric

Refractometric

Titration

A pseudo uni-molecular reaction has order of reaction :

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3

2

1

0

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.

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

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

When copper is allowed to react with HNO₃, the reaction is slow in the beginning, finally becomes very fast. It is due to the formation of an auto catalyst which is

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Cu(NO₃)₂

CuO

O₂

HNO₂

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Small change in concentration of product

Small time internal

Co-efficient of the reactant

Co-efficient of the product

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Zero

1

2

1.5

In the hydrolysis of CH₃COOC₂H₅the acid produced is

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Inhibitor

Catalyst

Auto catalyst

None of above

The factor which effect the rate of reaction

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Nature of reactants

Surface area

Light

All of the above

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2

3

4

9

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 example of a photo chemical reaction is photosynthesis has order of reaction :

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1

2

0

3

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

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 effective activity of a metal catalyst is increased if it is in

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Solid form

Liquid state

Gaseous state

Finely divided form

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

______ are called biocatalysts

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Organic acids

Organic bases

Enzymes

All

To determine the rate of reaction chemically a graphical method is applied. A graph is plotted between the amount or reactant decomposed or product formed against the time. The rate d_x/d_tat any time is equal to

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k

Tangentθ

1/a, a is initial conc.

1/a²

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