Question # 1

Energy of atom in compound is

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Higher than individual atom

Lower than individual atom

equal to individual atom

Impossible to predict

According to kinetic theory of gases there are

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Intermolecular attractions

Molecules which have considerable volume

No intermolecular forces of attraction

The velocity of molecules decreases for each collision.

The diffusion of gasses at absolute zero will be:

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Slightly decrease

unchanged

Slightly increased

Zero

The unit of pressure ______ is commonly used by meteorologists

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mm of Hg

Kilopascal

Millibar

Pound per square inch

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

Steam causes more seers burns than boiling water. It is due to

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Latent heat of fusion

Latent heat of vaporization

Latent heat of sublimation

All of above

The structure of sodium chloride is

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simple cube

body centered cubic

face centered cubic

depends upon conditions

Among solids,the highet melting point is exhibited by

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Covalent solids

Ionic solids

Pseudo solids

Molecular solids

A reaction A- B is independent of concentration of reactant A. The order of reaction will be

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First order

Second order

Third order

Zero order

Oxygen and sulphur are present in VI-A group of the periodic table The hydride of oxygen i.e., H2O is liquid at room temperature but the hydride of sulphur (H2S) is a gas. This is due to

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greater bond angle of water than Hs

greater bond lengths in HS than H2O

hydrogen bonding in water

acidic character of HS

How many grams of NaOH are present in 250 cm3 of its 0.2M solution

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,4 g

, 0.4 g

, 10 g

, 2 g

A covalent bond may be

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100% covalent

Partial ionic

100% ionic

Both a and b

Among the following molecules, which one has coordinate covalent (dative) bond?

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CCI4

CO2

CO

CH4

The units of ionic product of H2O is

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Mole dm-3

Mole2 dm-6

Mole-1 dm-3

Mole-2 dm-6

The Kw. of water at 25 C° is given by

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10(-7)

10(-10)

10(-12)

10(-14)

Amorphous means

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arranged

ordered

shaped

shapeles (no arrangements)

Plasma was introduced by

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Crookes

Soddy

Faraday

Van der Waal

In elimination reaction i.e, in the formation of alkene, the reactivity of alkyl halide is in the order:

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CI>Br>I

I>Br>Cl

Br>CI>I

I>CI> Br

When liquid solute is dissolved in liquid solvent, then the best unit of concentration is?

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% W/W

% W/V

% V/V

%V/W

The slope of the graph is steepest at the beginning of reaction showing

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Rapid decrease in concentration of reactants

Rapid increase in concentration of reactants

Fast rate of reaction

All of the above

Helical structure of proteins is stabilized by

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Peptide bond

Dipeptide bond

Van der Wall's forces

Hydrogen bonding

Crystal lattice of the substances can be categorized into

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five types

seven types

six types

none of these

If R, T, M, V and P are gas constant, temperature, molar mass, volume and pressure then density is given by:

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M/V

RT/M

PM/RT

V/M

According to Hess's law, the enthalpy change for a reaction

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Depends on path

Independent of the path

The sum of ∆E and ∆H

None of these

The kinetic theory of gases predicts that total kinetic energy of a gaseous assembly depends on

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Pressure of the gas

Temperature of the gas

Volume of the gas

Pressure,temperature,and volume of the gas.

The reaction which is responsible for the production of electricity in the voltaic cell is

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Hydrolysis

Oxidation

Reduction

Redox

The crystal system which has all cell angles equal, but not 90°and less than 120° , the system is

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orthorhombic

monoclinic

hexagonal

rhombohedral

Which of the following liquids have low vapour pressure at 25°C

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Water

Ethyl alcohol

Acetone

Diethyl ether

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

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Inversion temperature

Critical temperature

Neutral temperature

Curie point

Which of the following are not known to form compounds in more than one oxidation state?

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Transition metals

Halogens

Alkali metals

Noble gases

Saturated hydrocarbons having carbon atoms more than 20 in a molecule are solids due to

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higher densities

higher molar masses

the chain, are more zig-zag

all are correct

When 1-butene reacts with bromine, the product formed will be

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1, 3-dihydroxy butane

But-1, 2-diol

1, 3-dihydroxy butan-diol

1,2-dibromo butane

The volume of a gas that is occupied by its one mole at STP is called

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total volume

normal volume

molar volume

atomic volume

chemist was able to measure the value of lattice energy of KCI to be 690 kj/mol.

From this experiment , he concluded that:

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lattice energy of KBr is 665 kj/mol and that of Ki is 630 kj/mol

lattice energy of KBr is 765 kj/mol and that of Kl 730 kj/mol

lattice energy of KBr is 730 kj/mol and that of Ki 765 kj/mol

lattice energy of KBr is 630 kj/mol and that of kL 665 KJ/mol

NH₃can form only one hydrogen bond per molecule though it has three partially positively charged hydrogens

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nitrogen in NH₃has only one ions pair of electrons which can make one H-bond

ammonia is a base

ammonia is a weak acid

it ionizes to give one H⁺

According to the kinetic theory of gases,in an ideal gas,between two successive collisions a gas molecule travels

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Ina circular path

In a wavy path

In a straight line path

With an accelerated velocity

Which of following factor affect vapour pressure of a liquid?

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temperature

inter molecules forces

size of the molecules

all of these

The amount of heat required to convert one mole of solid into liquid is called

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molar heat of fusion

heat of fusion

heat of vaporization

heat of liquefaction

The boiling point of H2O is 100°C while that of C2H5-OH is 78.5C°. The reason is that:

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H2O molecules are small-sized

the bond angles at oxygen atom are different

C2H5-group is electron donating

the number of H-bonds are greater in H20, than C2H5-OH

The value of critical temperature of a gas depends upon its:

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Size

Intermolecular forces in it

Shape

All of above

Benzene has pi electron

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2

4

6

8

Van der Waal's forces exist in

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Polar compounds

Non-polar

Covalent

All types of atoms and molecules

The root mean square velocity of a gas is doubled when the temperature is

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reduced to half.

reduced to one-fourth

increased four times

inereased two times

Which of the following liquid has high vapour pressure?

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H₂O

ether

CH₃OH

C₂H₅OH

To cook the food at a high mountain is difficult as compared to at sea level. The reason is that:

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the temperature at the top of the mountain is low

the density of water decreases at the mountains

the boiling point of water decreases at the mountain

the hydrogen bonding in water changes with the change of height

Which of the following alcohol cannot be produced by treatment of aldehydes or ketones with NaBH4

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I-propanol

2-Methyl-2-propanol

2-propanol

Ethanol

Which is not true in case of an ideal gas?

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It cannot be converted into a liquid

There is no interaction between the molecules

All molecules of the gas move with same speed

At a given temperature P'V is proportional to the amount of the gas

As gases can adopt the shape of the container so they have

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no fixed shapes

fixed shapes

different shapes

definite shapes

Which set of elements is good loser of electrons

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F2. Cl2, Br2

N, P. As

O. S, Se

Li, Na, K

The B.P of H2O at Murree Hills is

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99.8C

98°C

100C°

89°C

R = 0.08205:

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atm dm³mol^-1k^-1

J mole^-1k^-1

Nm mol^-1k^-1

cal. mol^-1k^-1

During oxidation process, oxidation number of an element

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Decreases

Increases

Remains constant

Both a and b

The density of neon will be highest at

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STP

0°C, 2 atm

273°C, 1 atm

273°C, 2 atm

A real gas most closely approaches the behaviour of an ideal gas at

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15 atm. and 200 K

1 atm. and 273 K

0.5 atm.and 500 K

15 tm, and 500 K

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 kinetic energy of 4 moles of nitrogen gas at 127°C is? cals.(R = 2 cal mol^-1 K^-1)

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4400

3200

4800

1524

Bonding in MgO is an example of

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lonic bond

Polar bond

Covalent bond

Coordination covalent bond

The height of the peak in the mass spectrum shows

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Number of isotopes

Relative abundance

Mass number

Number of protons

The rate diffusion of H₂is 4 times than the of an unknown gas at same temperature and pressure, the molecular mass of unknown gas is

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32

16

4

64

Which of the following is not a property of enzymes?

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extraordinary speciffcity

reversibility of reactions

high efficiency

minimum activity at optimum T

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