Question # 1

Activation energy is the difference of energy between the energy of the reactant and

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The product

The activated complex

Both a and b

None of these

Optical rotation method is sued when

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Reaction involve ions

Change of refractive indices

Reactions involving change of optical activity

None of the above

The rate of reaction :

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Increase as the reaction proceeds.

Decreases as the reaction proceeds.

Remains the same as the reaction proceed.

May decrease or increase as the reaction proceeds.

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.

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

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1

2

0

3

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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Complex protein molecules which catalyses the organic reactions in the living cells are called

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Living organisms

Enzymes

Viruses

Bacteria

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.

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

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

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Third order reaction

Second order reaction

First order reaction

Zero order reaction

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

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Rate = k[FeCl₃] [Kl]²

Rate = k[Fe⁺³][Cl^-1] [Kl]

Rate = k[Fe⁺³] [Cl^-1][K;]

Rate = k[Kl]³[FeCl₃]°

In the hydrolysis of CH₃COOC₂H₅the acid produced is

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Inhibitor

Catalyst

Auto catalyst

None of above

In the hydrolysis of CH₃COOC₂H₅the acid produced is

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Inhibitor

Catalyst

Auto catalyst

None of above

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.

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

In exothermic reaction decrease in potential energy of the products will result in

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Decreases in kinetic energy of the particles

Increases in kinetic energy of the particles

No change in kinetic energy

Decreases in activation energy

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

The rate of reaction is denoted by

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dc/dp

dc/ac

dc/dT

dc/dt

The reaction rate is expressed in the units of

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Mol dm^-3S^-

Mol dm^-3

Mol dm^-3N^-

dm^-3S^-

The unit of rate constant is the 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.

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

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Zero

First

Second

Third

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

The rate determining step is the :

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Slowest step.

Fastest step.

Moderate step.

Both (a) and (b).

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.

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

Hydrogenation of vegetable oils is accelerated by Ni catalyst. The catalytic activity of Bi is increased by a promoter of activator which is

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Na and K

Na and Hg

Hg and Zn

Cu and Te

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

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

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First order

Pseudo first order

Second order

Zero order

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