Question # 1

The nature of crystals formed due to London forces of interaction are

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molecular

metallic

ionic

covalent

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

The number of atoms or molecules whose concentrations determines the rate of a chemical reaction is called the

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Molecularity of the reaction

specific activity of the reaction

Order of the reaction

rate constant of the reaction

The largest number of molecules are present in

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3.6 g of H2O

4.6 g of C2H5OH

2.8 g of CO

5.4 g of N2O5

The pressure exerted by the vapours in equilibrium with its pure liquid at given temperature is called the

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equilibrium pressure

atmospheric pressure

vapour pressure

external pressure

Relationship between volume of a gas and prevailing conditions of temperature and pressure are called

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Gas laws

Equilibrium laws

Rate laws

None of these

The most unsymmetrical one in crystal system is

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triclinic

Li, Na, K

monoclinic

hexagonal

C=O and C=C bonds are differentiated by

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Hybridization of C-atom

Bond angles

Ammonical AgNO3

Conc. HNO3

Active sulphonating agent during sulphonation of benzene is

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SO2

SO3

SO3H

SO3+

Which of the following statements about amorphous solids is incorrect?

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They melt over a range of temperature

They are anisotropic

There is no orderly arrangement of particles

They are rigid and icompressible

lonic solids are characterized by which one of the following properties

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moderately low pressure

high vapour pressure

good conductivity in solid state

solubility in polar solvents

How many isotopes are present in palladium

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Two

Four

Six

nine

Formation of Picric acid from phenol needs heating, one possible reason for it is

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acidity of phenol

e- donating nature of-OH

acidity of picric acid

e- with drawing effect of- NO2

Van der Waal's forces exist in

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Polar compounds

Non-polar

Covalent

All types of atoms and molecules

A mixture of 1-chloropropane and 2-chloro-propane when treated with alcoholic KOH, gives

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Prop-2-ene

Isopropy lene

Propene

A mixture of prop-l-ene

Sudden expansion of gas molecule cause cooling because

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Expansion release some amount of energy

During expansion new force of attraction are developed and energy is released

During expansion force of attraction between closest molecules break and energy is used

Kinetic energy of gas molecules increases

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

In which of the following compounds hydrogen bonding is not present

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water

ethanol

ether

ammonia

Estyl butyrate has flavour like

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Banans

Jasmine

Pineapple

Orange

The element which exhibits maximum catenation property is

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C

Pb

Ge

Sn

AgNO₃ is a polymorphic having two different crystalline forms which are

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cubic, tetragonal

monoclinic, hexagonal

cubic, orthorhombic

orthorhombic, rhombohedral

If temperature is 73K and volume is 146 cm3 then calculate the value of K=V/T

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5

4

3

2

A doubly bonded carbon is

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cannot be sp2 hybridized

can be sp hybridized

can attach with three carbons

can attach with three hydrogens

The most complex strueture a single polypetide can assume is

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1° structure

2°structure

3° structure

4° structure

The electrochemical series is based on

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pH scale

Redox scale

Hdrogen scale

Arrhenius scale

Which of the following elements is most metallic

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Bi

sb

As

P

NaCI has face centered cubic structure. The Na ion at the face of the unit cell is shared by

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2-unit cells

4-units cells

only one unit cell

8-unit cells

Increased concentration of enzyme alkaline phosphatase is a sign of

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hemophilia

heart disease

thrombosis

rickets

Dehydrogenase is an erample of

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Transferase

Hydrolase

Lyase

Oxido-reductase

The reaction of alkyl halide in the presence of alcoholic KOH is

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Substitution

Addition

Acid-base

Elimination

Which element differs from rest of elements of its group?

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Ba

Mg

Ca

Be

Bonding in MgO is an example of

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lonic bond

Polar bond

Covalent bond

Coordination covalent bond

Which pair of following pair is metalloid?

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Antimony and bismuth

Phosphorous and arsenic

Nitrogen and phosphorous

Arsenic and antimony

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 gases have lowest density at room temperature

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CO

N₂

Ne

NH₃

Electrons in 5d energy level are filled up in case of

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Lanthanides

Transition metals

Actinides

Rare gases

In graphite crystal, carbon is

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sp hybridized

sp²hybridized

sp³hybridized

None

The scale of temperature that shows the freezing point of water at 0° is called

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Fahrenheit

Kelvin

absolute

Celsius

The total K.E. of one mole of an ideal gas is given by:

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1/2 RT

3/2 RT

1/2 KT

3/2 KT

The substitution of a'-H' by '-NO2' group in benzene is called

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Nitration

Sulphonation

Ammunolusis

Reduction of benzene

The pressure of gas at constant temperature in a container of 2dm3 is 10 atm what will be its final pressure if it is connected with 10 dm3 container

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2 atm

1.6 atm

5 atm

I atm

What is the formula of magnesite?

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PbS

MgSO4. 7H2O

MgCO3

CaCO3

The temperature below which a gas does not exist is called its

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Inversion temperature

Critical temperature

Neutral temperature

Curie point

Total pressure of mixture of two gases is:

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The ratio of their partial pressure

The product of their partial pressure

The difference partial pressure

The sum of their partial pressure

Out of monochloro, monobromo and mongiodo derivatives of ethane, the mos reactive compound towards nucleophilic substitution will be

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C2H5Br

C2H5Cl

C2H5I

All are equally reactive

Which of the following is soluble in water?

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СН3ОН

CCL4

CHCI3

CS2

^{The common oxidation number of halogens is}

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-1

+1

-2

0

The forces of attraction between the solid atoms of helium are

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hydrogen boding

coordinate covalent bond

covalent bond

London dispersion force

Air at sea level is dense.This is a practical application of

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Boyle's law

Charle's law

Avogadro's law

Dalton's law

Air contains 78% N₂, 21% O₂ and 1% other gases at sea level the partial pressure of O₂ is

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760 torr

159 torr

592 torr

7.6 torr

Which of the following statement is not true?

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The pressure of a gas is due to collision of the gas molecules with the walls of the container.

The molecular velocity of any gas is proportional to the square root of the absolute temperature.

The rate of diffusion of a gas is directly proportional to the density of the gas at constant pressure.

Kinetic energy of an ideal gas is directly proportional to the absolute temperature.

Which of the following statement about the order of reaction is true?

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The order of reaction can only be determined by experiment

a second order reaction is also bimolecular

The order of reaction is always non-zero

The order of reaction increases with increasing temperature

At constant temperature when pressure of a gas is plotted against volume, the curve is:

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Slanting straight line.

Parabolic.

Straight line, parallel to pressure axis.

Of neither type.

Ethene C₂H₄and N₂gases diffuse at the same rate at room temperature. it is due to the reason

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these are non polar gases

their molecular masses are same

both are covalent molecules

both have multiple bonds

The geometry of diamonds is

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tetragonal

cubic

rhombohedral

none of these

Value of gas constant R is

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8.314 J K^-1mol^-1

0.082 J K^-1mol^-1

273.15 J K^-1mol^-1

101325 J K^-1mol^-1

Relative acidic strength of alcohol, phenol, water and carboxylie acid is

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Carboxylic acid > Alcohol > Phenol > Water

Carboxylic acid > Phenol > Water> Alcohol

Water > Alcohol> Phenol > Carboxylic acid

Phenol > Carboxylic acid > Alcohol> Water

What is distilled first?

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Liquid CO₂

Liquid N₂

Liquid O₂

Liquid H₂

The number of Na+, ions which surround each Cl- ion in the NaCl crystal lattice is

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8

12

6

10

An element from the given below exists as discrete small molecules in the solid state. Which is that?

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Sodium

Silicon

lodine

lron

Which one of the following will react with bothethand and ethanoic acid at room temperature

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CaCO3

CuO

Na-metal

CH3OH