Question # 1

Tertiary alcohols have alpha bydrogens

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1

Zero

2

3

The structure of sodium chloride is

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simple cube

body centered cubic

face centered cubic

depends upon conditions

The critical temperature of CO₂______°C at 73 atm critical pressure

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21.142

28.892

31.142

35.452

What forces operate between ethyl group of ethyl alcohol and oxygen of water

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H-bonding

attractive forces

repulsive forces

dipole forces

Boiling point of water is higher (100°C) than that of ethanol (78.5°C) although both have hydrogen bonding. This is because

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water molecules are closely packed

water is more acidic than ethanol

ethanol is an organic liquid

number of hydrogen bonds are more in H₂O

The partial pressure of gas can be calculated if we know total pressure of mixture and:

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Number of protons

Number of electrons

Number of neutrons

Mole fraction of gases

The order of reactivitv of alksI halides towards nucleophile is

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RI>RBr RF>RCI

RF>RCI>RBr>RI

RI>RBr> RCI>RE

RF>RBr>RCI>RI

Ethanoic acid reacts with all of these to produce water except

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Ethanol

Sodium

Caustic soda

Sodium hydrogen carbonate

The value of the vapour pressure of water at its boiling point at Karachi and Murree is

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same

different

depends upon the environmental conditions in both cities

greater at Murree and less at Karachi

K2SO4, and K2Cr2O4, are isomorphous solids and exist in

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cubic form

orthorhombic form

trigonal form

tetragonal

choose the temperature among the following at which real gas obeys ideal gas laws when pressure range is appreciable:

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critical temperature

boyle's temperature

inversion temperature

transition temperature

Soda lime is often employed to remove both

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H2O and NO2

CO2, and NO2,

H2O and CO2

H2S and CO2

The examples of a hexagonal system is

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sugar

graphite(a=b not equal to c) {Alpha =beta. not equal to gamma}

sulphur

diamond

Considering the physical properties of the gases, which of the following statements about particles of gas is not true. The particles

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orderly arranged

randomly moving

having wide spaces

causing pressure

Which of the following is primary alkyl halide

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IsopropyI halide

Sec-butyl halide

Tert-buryi halide

Neo-pentyl halide

Which af the following compound reacts slower than benzene in the electrophilic substitution.

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Phenol

Nitrobenzene

Toluene

Aniline

The forces which are present between the ions and the water molecules are known as

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dipole-induced dipole forces

dipole-dipole forces

ion-dipole forces

London dispersion forces

Evaporation of liquid takes place at every temperature. What when temperature becomes constant?

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the rate of condensation is greater than teh rate of condensation

it depends upon the nature of the liquid

rate of evaporation is greater than the rate of condensation

the rate of condensation and evaporation become equal

Which compounds is alicyclic in nature?

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Cyclobutane

Iso-bstand

n-Butane

Toluend

Which one of following property is not true about alkali metals?

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Strongest bases due to their hydrides

Low ionization energy

Oxidation number more than +1

Form acidic oxides

Which of the following alcohols is least reactive with respect to 0-H bond

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CH3OH

CH-CH2-OH

(CH3)2-CH-OH

(CH3)3OH

Viscosity of a liquid is measured by

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barometer

thermometer

viscometer

manometer

Crystal can be classified in to ......basic crystal habits

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7

4

14

3

Vapour pressure of a substance does not depend upon:

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physical state of matter

temperature

intermolecular forces

surface area

In the esterification, first attack is due toon carborylic acid

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Hydrogen ion

Alcohols

Water

All

The pressure of 5dm³gas increase from 250 torr to 500 torr then new volume of gas

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500 cm³

375 cm³

2500 cm³

None of these

Which of the following liquid has higher boiling point?

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HCl

HBr

H₂O

Br₂

Hydrogen bonding is extensively present in proteins which form the spiral. The hydrogen bond being produced is between

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nitrogen and hydrogen atom

oxygen and hydrogen atom

carbon and hydrogen atom

oxygen and carbon atom

The amount of energy released when gaseous ions of opposite charges combine to give one mole of a crystalline ionic compound is called

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bond energy

heat of formation

lattice energy

ionization energy

In voltaic cell a saht bridge is used in order to

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Pass the electric current

Prevent the flow of ions

Mix solutions of two half cells

Allow movement of' ions between two cells

The elements for which the value of ionization energy is low can

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Gain electrons readily

Lose electron less readily

Gain electrons with difficulty

Lose electron readily

The crystal of diamond is

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ionic

molecular

covalent

metallic

Which is an intermediate in Svl

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Ethoxide ion

Alkene

Alkyl halide

Carbocation

Which of the following are more temperature senesitive

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Liquid crystals

Solid crystals

Ionic stals

None of above

Most of the reactions which give stable products are

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Endothermic

Exothermic

Isothermal

Non of these

One dm³of O₂at STP has mass

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32 g

16 g

4.438 g

1.4383 g

The B.P of H2O at Murree Hills is

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99.8C

98°C

100C°

89°C

Stronger the oxidizing agent, higher is

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Redox potential

Standard reduction potential

Reduction potential

_{Oxidation potemial}

The elements of group I-A react violently with water and make the solution

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neutral

amphoteric

acidic

alkaline

The oxidation of SO2 to SO3 is exothermic reaction. The yield of SO3 will be maximum if

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Temperature is increased and pressure is kept constant

Temperature is reduced and pressure is increased

Both temperature and pressure are increased

Which of the following is more reactive where 0-H bonds break

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P°alcohol

T° alcohol

S°alcohol

Cannot be predicated

Which of the following may be called London dispersion forces

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dipole-dipole forces

ion-dipole forces

dipole-induced dipole forces

instantaneous dipole-induced dipole forces

The oxidation of 1 - propanol in the presence of H2SO4, +K2Cr207 produces final product

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Acetaldehyde

Propanal

Acetone

Propanoic acic

The vapour density of a gas is 11.2.The volume occupied by 11.2 g of this gas at N.T.P is

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22.4 litres

11.2 litres

1 litre

2.24 litres

Which order of vapour pressure in the following liquids is correct

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water > ethanol > acetone > ether

ether > acetone > ethanol > water

ether > ethanol > acetone > water

water > ether > acetone > ethanol

The crystal system are of

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7 types

10 types

5 types

8 types

The highest melting point is observed by

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Butanoic acid

Propanoic acid

Pentanoie acid

HCI

Evaporation causes

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High temperature

High pressure

Cooling

Vapour

The existing property of an element in to more than are crystalline state is termed as:

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isomorphism

polymorphism

isotropy

allotropy

Which will not react with phenol

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NaOH

Br2

KMn04/OH-

Na

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

Total number of valence electrons in CH4

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8

9

10

12

Coinage metals Cu, Ag and Au are the least reactive because they have

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Negative reduction potential

Negative oxidation potential

Positive reduction potential

Positive oxidation potential

The specifie substance (metabolite) that fits on the enzyme surface and is converted to products is called

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Co-factor

Isoenzyme

Prosthetic group

Substrate

Gases of air, always remain in random motion and do not settle due to:

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Difference of molecules masses of air gases.

Difference in partial pressure of gas molecules.

Unequal number of different gas molecules.

Elastic collision of gas molecules.

Which one of the following is an appropriate indication of positive iodoform test?

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Formation of H2O

Brick red precipitate

Release of H2 gas

Yellow precipitate

The relationship which describes the variation of vapour pressure with temperature is called

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Hess's law

Arrhenius equation

Kirchhoff's law

Clausius-Clapeyron equation

Which element differs from rest of elements of its group?

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Ba

Mg

Ca

Be

In which of the following processes the liquids are made to boil at low temperature

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Vacuum distillation

Destructive distillation

Distillation

Vacuum destructive distillation

Amorphous solids:

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have sharp melting point

undergo clean cleavage when cut with knife

have prefect arrangement of atoms

can possesses small regions of orderly arrangement

The gases law describe the ______ Behaviour of gases

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Variable

Constant

Uniform

Best