Question # 1

In an experiment the concentration of a reactant 'A' is doubled the rate increases four times. If concentration in tripled, then rate increases nint times. Thus the rate is proportional to ______ of concentration of 'A'

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Square root

Square

Twice

Cube

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

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Small change in concentration of product

Small time internal

Co-efficient of the reactant

Co-efficient of the product

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 reaction rate is expressed in the units of

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mol dm^-3S^-

mol dm^-3

mol dm^-3N^-

dm^-3S^-

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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Rate is independent of concentration of water since it is in excess

Rate is independent of concentration of ester since it is in exces

Rate depends upon the concentration of acid catalyst added

Rate = k[CH₃COOC₂H₅]^1/2[H₂O]^1/2

The number of atoms or molecules whose concentrations determine the rate of the reaction is called

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Molecularity

Order

Rate of reaction

Rate constant

The sum of the exponents of the conc. terms in the rate equation is called

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Rate of reaction

Order of reaction

Specific rate constant

Average rate

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

Which technique is used to determine the absorption of radiations?

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Dilatometer method

Optical rotation method

Spectrometry

Refractometric method

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

The reaction rate is expressed in the units of

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Mol dm^-3S^-

Mol dm^-3

Mol dm^-3N^-

dm^-3S^-

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

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Zero

1

2

1.5

When initial concentration of reactants an order of reaction is given, then its half life period can be calculated by the equation

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The unit of rate of reaction is

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mole dm^-3

mole Kg^-1

moles dm^-3sec^-1

grams dm^-3

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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Homogeneous

Heterogeneous

Isogeneous

None

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.

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

All reactions occur in :

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A single step.

A series of steps

Two steps.

Both (a) and (b)

The unit rate of constan K ismole^-1 dm³S^-1for a chemical reaction, the order of reaction is :

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3

2

1

0

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

which one of the following is a heteroheneous catalysis

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Rate of chemical reaction depends upon :

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The number of total collisions per second.

Number of molecules taking part in a chemical reaction.

Number of fruitful collisions per second

Number of fruitless collisions per second.

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

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Order

Molecularity

Rate constant

Rate law

If a reactant or product of a reaction absorbs radiation, then physical method for determining the rate of reaction is

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Spectrometry

Refractometry

Conductivity measurement

Optical method

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

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

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