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.

Ionic Solids are characterized by

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Low melting points

Good conductivity in solid state

High vapour pressure

Solubility in polar solvents

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

In a group on going downward, polarizability generally:

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Decreases

Increases

Remain constant

Negligible

In a group on going downward, polarizability generally

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Decreases

Increases

Remains constant

Negligible

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

Evaporation of water is possible at:

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Above 100°C

0°C

100°C

At all temperature

The boiling point of NH_{3 is maximum among the hydrides of group V elementsdue to:}

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Enhanced electronegative character of Nitrogen

Pyramidal structure of NH3

Very small size of Nitrogen.

Enhanced electropositive character of Nitrogen

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

Hydrocarbon molecules 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.

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

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

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 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

Trend of boiling point of halogens from fluorine to Iodine is that it

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Decreases

Is negligible

Increases

Remains constant

Force of attraction b/w atoms of He is :

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London dispersion forces

Hydrogen bonding

Coordinate covalent bond

Covalent bond

Hydrogen bonding is present between the molecules of

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NH₃

H₂O

HF

All of above

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

London dispersion forces are alos called:

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Hydrogen bonding.

Debye forces

Van der Waal's forces

Instantaneous dipole-induced dipole forces.

Hydrogen bonding is present in one of the following pairs:

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NH₃

H₂O

HF

All of above

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

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Diethyl ether

Acetone.

Water.

Ethyl alcohol.

A liquid on evaporation causes:

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Heating effect.

Cooling effect.

Suffocation .

All of above

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

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

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

Amorphous solids

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Have sharp melting point

Undergo clean cleavage when cut with knife

Have perfect arrangement of atoms

Can possesses small regions of orderly arrangement of atoms

A liquid on evaporation causes

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Heating effect

Cooling effect

Suffication

All of above

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

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Diethyl ether

Acetone

Water

Ethyl alochol

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