Question # 1

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

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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.

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

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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

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 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 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

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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Zero

253 sec

150 sec

500 sec

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

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1

2

0

3

Platinum is poisoned by

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Arsenic

Silver

Argon

Zinc

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 of the following is not affected by light

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If initial concentration of the reactants and half life period of the reaction is known, then we can determine

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Average rate of reaction

Order of reaction

Rate constant k

Instantaneous rate

The unit of rate of reaction is

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mole dm^-3

mole Kg^-1

moles dm^-3sec^-1

grams dm^-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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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

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

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First order

Pseudo first order

Second order

Zero order

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1st order

2nd order

Zero order

3rd order

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

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

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Living organisms

Enzymes

Viruses

Bacteria

Rate law of an equation is obtained :

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From a balance equation.

Can be calculated theoretically as well as determined experimentally.

It is only calculated theoretically.

Experimentally.

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.

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Small change in concentration of product

Small time internal

Co-efficient of the reactant

Co-efficient of the product

Decreases om concentration of reactant is denoted by

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dc/dt

-dc/dt

+dc/dt

None

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 rate of reaction determined at a given time is called

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Average rate

Instantaneous rate

Specific rate

Overall rate

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Measuring pH

Measuring density

Titration against standard NaOH

Titration against standard KMnO₄solution

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