Question # 1

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 only forces are London dispersion forces among the

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Atoms of He in gaseous state at high temperature

Molecules of water in liquid state

Molecules of solid I₂

Molecular of hydrochloric acid gas

Which of the following is a pseudo solid

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CaF₂

Glass

NaCl

All

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

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Sublimation.

Distillation.

Condensation.

Evaporation.

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

Hydrogen bonding is present between the molecules of

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NH₃

H₂O

HF

All of above

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

Which of the following is a pseudo solid?

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CaF₂

Glass

NaCL

All

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

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

In a group on going downward, polarizability generally:

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Decreases

Increases

Remain constant

Negligible

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

Evaporation of water is possible at:

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Above 100°C

0°C

100°C

At all temperature

Which one of the following is the weakest intermolecular force

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Dipole induced dipole forces

Ionic dipole forces

Electrostatics forces between ions

Dipole-dipole forces

The intermolecular forces in liquids are

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Negligible

Very weak

Very strong

Reasonably strong

Diamond is a bad conductor because:

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Ithas tight structure

It has a high density

There is no free electron present in the crystal of diamond of conduct electricity is transparent to light

Chloroform and acetone are soluble in each other due to:

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Instantaneous dipole interactions.

Dipole-dipole interactions.

Inter molecular hydrogen bonding.

All of above

In a group on going downward, polarizability generally

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Decreases

Increases

Remains constant

Negligible

Amorphous solids:

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Have a sharp melting point

Undergo clean cleavage when cut with knife

Have a perfect arrangement of atoms

Can possesses small regions of orderly arrangement of atoms

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 inter-molecular forces in liquids are:

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Negligible

Very weak

Very strong

Reasonably strong

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

London dispersion forces are also called

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Hydrogen bonding

Debye forces

Van de 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

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

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Sublimation

Distillation

Condensation

Evaporation

Evaporation of water is possible at

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Above 100⁰

0⁰

100⁰

At all temperature

Chloroform and acetone are soluble in each other due to

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Instantaneous dipole interactions

Dipole-dipole interactions

Intermolecular hydrogen bonding

All of above

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

Hydrocarbon molecule with large chain lengths experience:

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Weaker attractive forces

Stronger attractive forces

Repulsive forces

No attractive forces

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

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Diethyl ether

Acetone.

Water.

Ethyl alcohol.

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