Question # 1

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

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 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 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

Which statement is not correct

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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

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 reaction of oxalic acid with KMnO₄and H₂SO₄is slow at the beginning but after sometimes the reaction becomes faster due to

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Formation of MnSO₄which acts as 'Auto catalyst

Formation of CO₂which acts as 'Auto catalyst

Formation of K₂SO₄which acts as 'Auto catalyst

Evolution of O₂gas which acts as 'Auto catalyst

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First order

Pseudo first order

Second order

Zero order

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 addition of a catalyst to a reaction changes the

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Enthalpy

Entropy

Nature of reactants

Energy of activation

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 reactions occur at moderate rate :

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Rusting of iron

Chemical weathering of stone work of buildings by acidic gases in atmosphere.

Hydrolysis of an ester

Fermentation of sugars

The chemical method used for determination of rate of reaction is

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Spectroscopic

Conductiometric

Refractometric

Titration

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

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.

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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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

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

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Homogeneous

Heterogeneous

Isogeneous

None

A white precipitate ofsilver chlorideimmediately formed on additionof :

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Silver nitrate solution to sodium chloride solution.

Silver chloride solution to sodium nitrate solution.

Silver nitrate solution to potassium chloride solution

Silver nitrate solution to hydrogen chloride solution.

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

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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 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.

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