Question # 1

Soap is soluble in grease because it

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Is non polar

Has a hydrophobic head

Has a hydrophobic tail

Has an ionic head and a hydrocarbon tail

Which among the following is insoluble in water.

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LiOH

KOH

NaOH

RbOH

1-Chlorobutane on reaction with alcohols potash gives.

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1- butane

1-butanol

2- butane

2- butanol

The role of the mineral cryolite Na2AlF6 in the Hall process for aluminum production is.

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It is the source of aluminum

it is a chemical reducing agent

It forms a slag to remove impuriteis

In the molten state, it is a solvent for alumina Al2O3

The thermal conductivity of an SWNT along length is _____ watt/(m.k)

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35

330

386

3500

Which of the following elements would have the lowest first ionization energy

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Mg

Rb

Li

Ca

Which of the following is not a characteristics of terponoids.

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They are pleasant smelling liquids

They are steam volatile

They are nitrogenous bases

They are insoluble in water

Soapy detergents and soapless detergents behave differently in hard water because they

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Have different hydrophilic heads

Have different hydrophobic hydrocarbon chains

Have different pH values

Above A and C both

Sodium metal cannot be stored under

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Hexane

Benzene

Kerosene

Ethanol

Which type of elements form ionic hydrides.

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Transitionelements

Metalloids

Elements with high electronegativity

Elements with high electropositivity.

Which of the following impurities are present with the bauxite.

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Silica

Ferric oxide

Alumina

Both silica and ferric oxide

The alkali metal that react with nitrogen directly to form nitrides.

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Na

K

Rb

Li

The most stable oxidation state of chromium is.

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+6

+3

+4

+2

In urea the amount of nitrogen is

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82.0%

46.0%

33.0%

21.0%

The size of nanoparticles is between __________ nm

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100 to 1000

1 to 100

0.1 to 10

0.01 to 1

Homolytic fission of convalent bond results in the formation of.

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Free redicals

Carbocations

Carbonions

Both B and C

A major constituent of materials one whose amount in the materials is

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1% or more

0.1%

0.01%

0.001 %

Which of the following cells is used to produce electricity from chemical reaction

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Electroytic cell

Galvanic cell

Voltaic cell

Fuel cell

Both C and D

Which of the following substance is not present in acid rain.

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Sulphuric acid

Nitric acid

Acetic acid

Sulphurous acid

Which of the following statements is not correct with respect to applications of Hammett equations.

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It develops a quantitative relationship between structure and reactivity

This equation on can be used to calculate the value of pK_a

This equation does not help to calculate the rate of some reactions

This equation has mechanistic implications

The most reactive alkali metal among the following is

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Li

Na

Cs

Rb

Metal crystallize is system having co ordination number

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8

12

14

any one of above

CO belong to which group.

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C_2v

D_2h

C_av

D_ah

Which of the following parameter is not involved in calculations based on Born Haber Cycle.

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Ionization enthalpy

Electron gain enthalpy

Electronegativity

Bond dissociation energy

Organic farming is the technique of raising crops through uses of.

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Manures

Biofertilizers

Resistant varieties

All of these

Which of the following does NOT react with sodium hydroxide solution.

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Fat

Vinegar

Ethanol

Water

The dipole moments of the given species are such that.

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BF3 > NF3 > NH3

NF3 > BF3 > NH3

NHE > NF3 >BF3

NH3 > BF3 > NF3

Hydrolith is the common name of

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NaH

CaH2

NaF

CaF2

Which of the following is not obtained when Br2 is added to ethylene in the presence of aqueous NaCl solution.

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Br CH2CH2Br

Br CH2CH2Cl

ClCH2 CH2Cl

ClCH2CH2Cl

What is the scaling off of a surface in flakes or layers as the result of corrosion?

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Expoliation

Corrosion fatigue

Scaping

Fretting

Most effective pesticide is

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Carbonates

Organophosphates

Organ chlorines

All of these

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