Question # 1

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

Which of the following form normal oxide

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K

Li

Na

None

A macroscopic property of a system which describes the initial and final state of the system is called

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Physical property

Chemical property

Energy property

State function

Which of the following enzymes brings about the hydrolysis of fats?

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Urease

Maltase

Zymase

Lypase

The element with highest electron affinity among the halogen is

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F

Cl

Br

I

The presence of a double bond in a compound in the sign of:

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Saturation

Unsaturation

Subsitution

None

Naphthalene, iodine and NH_{4 can :}

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Sublime.

Both (a) and (c).

Crystallize.

None of above.

The addition of a catalyst to a reaction changes the

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Enthalpy

Entropy

Nature of reactants

Energy of activation

A half reaction can be defines as :

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It always occurs at cathode.

Involves only half of a mole of electrolyte.

Occurs at one of the electrode.

Goes only half way to completion.

Pure water does not conduct electricity because it

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Has low boiling point

Is almost unionized

Is neutral

Is readily decomposed

Aldehydes is distinguished from ketones by using

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Tollen's reagent

Benedict reagent

Fehling solution

All of the above

Which of these reactions is shown by buranone, CH₃COCH₂CH₃

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On warming with acidified potassium dichromative (IV) the solution turns green

On heating with Fehling's reagent a red precipitate is formed

With 2,4-dinitrophenlhydrazine reagent an orange precipitate is formed

With hydrogen cyanide an aldehyde is formed

Which compound would undergo nucleophilic addition

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Ethene, C₂H₄

Bromoethane, C₂H₅Br

Ethanal, CH₃CHO

Ethane, C₂H₆

The ionic bonds are

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Unidirectional

Bi-directional

Non-directional

Multi-directional

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0.073

0.147

0.05

0.026

Glucose in the presence of zymase is converted into

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Alcohol

Acid

Ethyl alcohol

Ketone

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

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First order reaction

Second order reaction

Third order reaction

Zero order reaction

Acetylene is used in the manufacture of

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Rubber

Plastic

Ethyle alcohol

All of these

Matter is defined as any thing which occupies space and:

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Molecules

Mass

Compound

Molecules

The alkyl halide is converted into an alcohol by

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Addition

Substitution

Dehydrohalogenation

Elimination

Linear geometry is present in:

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Sp³

Sp²

Sp

D²sp³

Ketones are prepared by the oxidation of

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Primary alcohol

Secondary alcohol

Tertiary alcohol

None of these

Number of neutrons in heavy hydrogen atom is

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0

1

2

3

During redox reaction an oxidizing agent

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Gains electrons

Is oxidized

Loses electrons

Hydrolysed

The reduction potential to copper electrode is +0.34 V and that of Zn electrode is -0.76 V. when these two are coupled the e.m.f. of the cell is

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-0.42 V

+0.42

-1.10 V

+1.10 V

Which of the following reagent will react with both aldehyde and ketones?

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Grinard's reagent

Tollen's reagent

Fehling's reagent

Benedict's reagent

What is the packet of energy called?

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Electron

Photon

Positron

Proton

B-B'-dichloroethyl sulphide is commonly known as

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Mustard gas

Laughing gas

Phosgene gas

Bio gas

K,Ca and Li metals may be arranged in decreasing order of their reduction potential as :

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Li, k, Ca

Ca, K, Li

Li, Ca, K

K, Ca, Li

Benzene is not prepared from

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Acetylene

Phenol

Benzoic acid

Bromo benzene

The oxidation state of an element is zero when

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It forms an oxide

It forms hydride

It is in free state

Only for noble gases

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