Question # 1

Which statement is not correct

Choose an answer

Enzymes catalyst a specific reaction

Enzymes show catalytic activity at a specific temperature

The catalytic activity of enzymes is stopped if optimum pH is changed

The catalytic activity is poisoned by a co-enzymes

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

Choose an answer

Molecularity

Order

Rate of reaction

Rate constant

The rate of reaction is denoted by

Choose an answer

dc/dp

dc/ac

dc/dT

dc/dt

Factor which slows down the rate of reaction is

Choose an answer

Small size of the particles of the reactant

High temperature of reaction

More concentration of reactant

Lowering the temperature

In the hydrolysis of CH₃COOC₂H₅the acid produced is

Choose an answer

Inhibitor

Catalyst

Auto catalyst

None of above

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

Choose an answer

8 hours

6 hours

4 hours

3 hours

By the use of catalysis the energy of activation is

Choose an answer

Decreased

Increased

Not affected

None

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

Choose an answer

First order reaction

Second order reaction

Third order reaction

Zero order reaction

Choose an answer

2

3

4

9

Rate law of an equation is obtained :

Choose an answer

From a balance equation.

Can be calculated theoretically as well as determined experimentally.

It is only calculated theoretically.

Experimentally.

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

Choose an answer

Average energy

Activation energy

Potential energy

Collision energy

Rate of chemical reaction depends upon :

Choose an answer

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 rate constant k of a reaction activation energy Ea and temperature are related by Arrhenius in the form of an equation which is

Choose an answer

With increases in temperature of 10 K of the reacting gases the rate of reaction is doubled because

Choose an answer

Increase in number of collisions

Number of molecules having energy more than Ea is doubled

Increase in order of reaction

Increase in surface area

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

Choose an answer

Order

Molecularity

Rate constant

Rate law

The reaction rate is expressed in the units of

Choose an answer

mol dm^-3S^-

mol dm^-3

mol dm^-3N^-

dm^-3S^-

When we perform the same reaction by taking two different initial concentrations of a reactant for a second order reaction then

Choose an answer

Reaction becomes exothermic

Energy of activation is different

Mechanism of reaction is changed

Half life period is changed

When the rate of reaction is entirely independent of the conc. of reaction molecules then order of reaction is

Choose an answer

Zero

First

Second

Third

In the manufacture of NH₃by Haber's process catalyst used is iron its catalytic efficiency is poisoned by

Choose an answer

Presence of Al₂O₃

Presence of Cr₂O₃

MnO₂

CO present with H₂gas

The rate of reaction :

Choose an answer

Decreases as the reaction proceeds

Increases as the reaction proceeds

May decrease or increase reaction proceeds

Remains same as the reaction proceeds

In zero order reaction, the rate is independent of :

Choose an answer

Temperature of reaction

Concentration ofreactants

Concentration of products

None of these.

Dilatometric method is used for rate determination when

Choose an answer

Reactions involving change of optical

Reactions involving change of optical activity

Reactions involving small volume change

None of above

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

Choose an answer

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.

Optical rotation method is sued when

Choose an answer

Reaction involve ions

Change of refractive indices

Reactions involving change of optical activity

None of the above

Which one of the following reaction rate is effected by the light

Choose an answer

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

Choose an answer

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

Choose an answer

Spectrometry

Refractometry

Conductivity measurement

Optical method

Half life period of a first order reaction is independent of:

Choose an answer

Presence of catalyst.

Conditions of temperature

Initial concentration of the compound

All of above

Choose an answer

Zero

1

2

1.5

Value of rate constant k is specific for a reaction, and varies from reaction to reaction. The value of k of a reaction changes with

Choose an answer

Time

Temperature

Concentration of reactants

Order of reaction

Group l-A elements react with water fastly than the reaction of group ll-A elements because

Choose an answer

l_Aelements are more soft then ll_A

l_Aelements are non-metals

l_Aelements have 1 electron in their outermost s-orbital and are strongly electropositive

l_Aelements make ionic bond

More Classes

Other Links

ECAT Chemistry Chapter 11 Reaction Kinetics Online Test MCQs With Answers

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer