Question # 1

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

Anthracene contains number of fused benzene rings

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1

2

3

4

Which equation among the following is applicable to an ideal gas equation?

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P = nRT

P = MRT

P = dPRT/M

V = dRT/M

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

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8

12

6

10

Neutralization of acid-base is

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Spontaneous

Exothermic

Non spontaneous

Both "a" and "c

The state of matter which exist only within a relatively narrow range of temperature and pressure

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Solid

Gas

Liquid

Plasma

According to kinetic molecular theory, kinetic energy of molecules increases when they are:

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melted from solid to liquid state

frozen into a solid

condensed into liquid

mixed with other molecular at low temperature

Which of the following is not the property of liquid crystal

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anisotropic

isotropic

three dimensional arrangement

fluidity

The highest temperature above which a gas cannot be liquified no matter how much pressure is applied, is called as

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critical temperature

absolute zero

liquefaction temperature

boiling point

Which of the following are responsible for the colour developed in transition elements compounds?

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s-orbitals

p-orbitals

d-orbitals

f-orbitals

Which compounds is alicyclic in nature?

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Cyclobutane

Iso-bstand

n-Butane

Toluend

Wt. of 112 ml of oxygen at NTP on liquifaction would be

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0.32 g

0.64 g

0.16 g

0.96 g

Acetaldchyde and ketone form addition product with

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Phenyl hydrazine

Hydroxylamine

Hydrazine

hydrogen cyanide

Solids in which atoms, ions or molecules are not regularly arranged are

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crystalline solid

amorphous solids

liquid crystals

low melting points

Which one of the following has zero dipole moment

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NH3

CHCI3

H2O

BF3

At ordinary temperature, the most nearly ideal gases are

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N₂

He

H₂

all these

Among solids,the highet melting point is exhibited by

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Covalent solids

Ionic solids

Pseudo solids

Molecular solids

Which of the following solids does not have a covalent bond?

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Silica

Copper

Diamond

Graphite

Which of the following is a non-crystalline solids pair

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Diamond, wood

Glass, table salt

Wood, glass

Sucrose, glass

Smell of cooking gas during leakage from gas cylinder is detected because of the property of:

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Effusion

Evapotration

Diffusion

Conduction

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

The solubility product of AgCl is
2.0 x 10(-10) mol2 dm(-6). The maximum concentration Ag+ ions in the solution is:

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1.41 × 10(-5) mol. dm(-3)

1.41 × 10(-10) mol. dm(-3)

2.0 × 10(-10) mol. dm(-3)

4.0 × 10(-20) mol. dm(-3)

Critical temperature for a gas depends upon

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Shape of molecule

Size of molecules

Inter molecular forces

All of these

Ethane when completely halogenated in excess of chiorine can form

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Hexachloroethane

Dichloroethane

Pentachloroethane

1.1.2.2-terachloroethane

An example of bydrolase is

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Amylase

Lipase

Fumarase

A,C

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

If absolute temperature of a gas is doubled and the pressure is reduced to one half, the volume of the gas will

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remain unchanged

increase four times

reduce to 1/4

be doubled

The vapour pressure of a liquid depends upon

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amount of the liquid

surface area

temperature

size of container

If there are weak intermolecular forces in a liquid, it will be

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more volatile

less volatile

more dense

less heavy

Which one of the following statements about positive ions is incorrect?

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they are also known as cations

they are formed when electrons are removed from atoms

they are larger than the atom from which hay were formed

they are smaller than the atom from which they were formed

Which pair of gases do not obey Dalton's law of partial pressures?

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H2 and He

NH3and HCl

H2 and O2

N2 and O2

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

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CCI4

CO2

CO

CH4

What will be the pH of 1.0 mol dm -3 of H2X, which is only 50% dissociated

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1

0

2

Less than 0

At 100 atm, CH₄ develops:

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Ideal attitude

Non-ideal attitude

Serious attitude

Laughing attitude

Primar structure of proteins refers to

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Coling and folding in form of specilie structure

3d structure

Number of amino acids in a chain

Alpha and Beta sheets

Which of the following metal does not liberate hydrogen on reaction with acid?

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Mg

Pt

Zn

Ca

The average bond energy of C-Br is

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228 kJmol-1

250 kJmol-1

200 kJmol-1

290 kJmol-1

Which of the following statement is correct if the intermolecular forces in liquids A,B and C are in the order A < B < C?

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B evaporates more readily than A

B evaporates less readily than C

A and B evaporates at the same rate

A evaporates more readily than C

The ideal gas law holds best under the conditions of

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high pressure and high temperature

low pressure and high temperature

low pressure and low temperature

high pressure and low temperature

Electrolytic products of dilute aqueous solution of sodium sulphate is

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Na. SO2

H2. S02

Na. O2

H2,O2

Which is trigonal cyrstal

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BaSO₄. 4H₂O

FeSO₄

NaNO₃

None

The arrangement ABC, ABC .... is referred as

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cubic close packing

octahedral close packing

hexagonal close packing

tetrahedral close packing

A graph between P and 1/V at constant temperature and number of moles of a gas meets the:

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Y-axis

X-axis

Origin

None of above

Which compound shows the highest melting point

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water

Propanoic acid

Methanoic acid

Ethanoic acid

The particles in solids are

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widely separated and moving randomly

widely separated not moving

moving randomly but not separated

close together and vibrating slightly

In Boyle's law which of the following pair is variable:

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Temperature and quantity of a gas.

Pressure and volume.

Volume and quantity of a gas.

Pressure and quantity of a gas.

Which is the correct order of boiling points

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structure of ice

solution of ethanol in water

solution o fNaCl in benzene

linking of helix protein molecule

Which one of the following will behave least like an ideal gas at high temperature and low pressure?

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hydrogen fluoride

helium

oxygen

carbon dioxide

Helium atom is two times heavier than a hydrogen molecule. At 298 K, the average kinetic energy of a helium atom is

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same as that of a hydrogen molecule

half that of a hydrogen molecule

two times that of a hydrogen molecule

four times that of hydrogen molecule

2-propanol on Oxidation gives

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Aldehyde

Carboxylic Acid

Ketone

Alcohol

Which thermometer will have its reading 273 degrees greater than that of thermometer C?

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A

B

B has 273 degrees greater than A

C has greater reading than all other thermometers

In van der Waal's equation of state of the gas law,the constant 'b' is measure of

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Intermolecular repulsions

Intermolecular collisions per unit volume

Volume occupied by the molecules

Intermolecular attraction

Two substances that have the same crystal structure are said to be

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isomorphous

anisotropic

isotropic

polymorphous

A temperature at which two cyrstalline forms of a substances coexist in equilibrium is called

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standard temperature

critical temperature

transition temperature

absolute temperature

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According to the general gas equation, density of an ideal gas depends upon

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Pressure

Temperature

Molar mass of the gas

All of the above

The non polar gases of low polarizability have a very:

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Low critical temperature

Stable critical temperature

High critical temperature

Van der Waals equation explains the behaviour of

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Real gases

Mixture of gases

Ideal gas

Diatomic gases

The long chains of amino acids are coiled around one another into a spiral by

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ionic bond

Van der Waal's forces

hydrogen bonding

overlapping of orbitals

Equal masses of CH₄and O₂are mixed in a 10 dm³container at 25°C. The partial pressures of CH₄and O₂are in the ratio of

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1 : 2

2 : 1

1 : 1

2 : 3

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

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Phenol

Nitrobenzene

Toluene

Aniline