Question # 1

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

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Diethyl ether

Acetone.

Water.

Ethyl alcohol.

Force of attraction b/w atoms of He is :

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London dispersion forces

Hydrogen bonding

Coordinate covalent bond

Covalent bond

London dispersion forces are also called

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Hydrogen bonding

Debye forces

Van de Waal's forces

Instantaneous dipole-induced dipole forces

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

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

London dispersion forces are alos called:

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Hydrogen bonding.

Debye forces

Van der Waal's forces

Instantaneous dipole-induced dipole forces.

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

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

In a group on going downward, polarizability generally

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Decreases

Increases

Remains constant

Negligible

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

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

Which of the following is a pseudo solid

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CaF₂

Glass

NaCl

All

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

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

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

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

The molecules of CO₂in dry ice from the

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Ionic crystalls

Covalent crystals

Molecular crystals

Any type of crystal

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 100°C

0°C

100°C

At all temperature

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

A liquid on evaporation causes:

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Heating effect.

Cooling effect.

Suffocation .

All of above

Evaporation of water is possible at

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Above 100⁰

0⁰

100⁰

At all temperature

Which one of the following is weakest inter molecular force?

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Dipole induced dipole forces

Ionic dipole forces

Electrostatic forces b/w ions

Dipole dipole forces

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.

In a group on going downward, polarizability generally:

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Decreases

Increases

Remain constant

Negligible

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

Choose an answer

Diethyl ether

Acetone

Water

Ethyl alochol

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

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Diethyl ether

Acetone.

Water.

Ethyl alcohol.

The inter-molecular 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

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