Question # 1

Hydrocarbon molecule with large chain lengths experience:

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Weaker attractive forces

Stronger attractive forces

Repulsive forces

No attractive forces

Escape of high energy molecules from the surface of liquid is called:

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Sublimation.

Distillation.

Condensation.

Evaporation.

Hydrocarbon molecules with large chain lengths experience

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Weaker attractive forces

Stronger attractive forces

Repulsive forces

No attractive forces

The boiling point of NH₃is maximum among the hydrides of group V elements due to

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Enhanced electronegative character of Nitrogen

Pyramidal structure of NH₃

Very small size of Nitrogen

Enhanced electropositive character of Nitrogen

The intermolecular forces in liquids are

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Negligible

Very weak

Very strong

Reasonably strong

Which of the following liquids has low vapour pressure at 25⁰C

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Diethyl ether

Acetone

Water

Ethyl alochol

The strongest forces are

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Debye forces

London dispersion forces

Dipole-dipole attraction

Hydrogen

Debye forces are present in one of the following pairs

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Na⁺ion and water

Argon and water

Argon and Na⁺ion

Ne and Water

At sea level and at 100⁰C the vapour pressure of water in an open system is

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1000 mm Hg

760 mm Hg

730 mm Hg

670 mm Hg

London dispersion forces are also called:

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Hydrogen bonding.

Debye forces

Van der Waal's forces

Instantaneous dipole-induced dipole forces.

Force of attraction b/w atoms of He is :

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London dispersion forces

Hydrogen bonding

Coordinate covalent bond

Covalent bond

Which of the following liquids has low vapor pressure at 25°C:

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Diethyl ether

Acetone.

Water.

Ethyl alcohol.

In a group on going downward, polarizability generally

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Decreases

Increases

Remains constant

Negligible

At sea level and at 100°C the vapor pressure of water in an open system is:

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1000 mm Hg

760 mm Hg

730 mm Hg

670 mm Hg

Polypeptide chains are coiled about one another into a spiral by

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Ionic bonds

Covalent bonds

Van der Waal's forces

Hydrogen bonds

Rate of evaporation and rate of condensation at equilibrium

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Become very low

Become very high

Become equal

Can never be equal

HF has exceptionally low acidic strength due to:

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Smaller size of fluorine.

Stronger polar bond between H and F.

Electronegativity of fluorine

Strong hydrogen bonding

Debye forces are present in on of the following pairs:

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Na+ion and water

Argon and water

Argon and Na+ion

Ne and water

The gases can be converted into liquids by

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increasing the pressure only

Lowering temperature and increasing pressure

Increasing pressure and bringing temperature below critical point

Lowering temperature only

Heat of vapourization for liquids with strong dipole-dipole forces will have

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Negligible Values

Reasonably high values

Very high values

very low values

Ionic solids are characterized by :

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Low meeting points

Good conductivity in solid state

High vapor pressure

Solubility in polar solvents

Escape of high energy molecules from the surface of a liquid is called

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Sublimation

Distillation

Condensation

Evaporation

Diamond is a bad conductor because

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It has a tight structure

It has a high density

there is no free electron present in the crystal of diamond of conduct electicity

Is transparent to light

Which of the following is a pseudo solid?

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CaF₂

Glass

NaCL

All

HF has exceptionally low acidic strengths due to

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Smaller size of fluorine

Strong polar bond between H and F

Electronegativity of fluorine

Strong hydrogen bonding

London dispersion forces are alos called:

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Hydrogen bonding.

Debye forces

Van der Waal's forces

Instantaneous dipole-induced dipole forces.

The density of water decreases, When it is freezed at 0°C

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Change of bond length

Change of bond angles

Cubic structure of ice

Empty spaces present in the structure of ice

Rate of evaporation and rate of condensation at equilibrium:

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Become very low

Become very high

Become equal

Can never be equal.

The molecules of CO₂in dry ice from the

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Ionic crystalls

Covalent crystals

Molecular crystals

Any type of crystal

Hydrogen bonding is present between the molecules of

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NH₃

H₂O

HF

All of above

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