Question # 1

London dispersion forces are alos called:

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Hydrogen bonding.

Debye forces

Van der Waal's forces

Instantaneous dipole-induced dipole forces.

]Which of the following is a pseudo solid?

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Atoms of He is gaseous stat at high temperate.

Molecules of water in liquid state.

Molecules of solid l₂

Molecular of hydrochloric acid gas

Evaporation of water is possible at

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Above 100⁰

0⁰

100⁰

At all temperature

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

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

Force of attraction b/w atoms of He is :

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London dispersion forces

Hydrogen bonding

Coordinate covalent bond

Covalent bond

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

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

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Sublimation.

Distillation.

Condensation.

Evaporation.

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

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 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

In a group on going downward, polarizability generally:

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Decreases

Increases

Remain constant

Negligible

Hydrogen bonding is present between the molecules of

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NH₃

H₂O

HF

All of above

Evaporation of water is possible at:

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Above 100°C

0°C

100°C

At all temperature

Ionic solids are characterized by :

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Low meeting points

Good conductivity in solid state

High vapor pressure

Solubility in polar solvents

London dispersion forces are also 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^oC because of

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Change of bond lengths

Change of bond angles

Cubic structure of ice

Empty spaces present in the structure of Ice

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

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

The inter-molecular forces in liquids are:

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Negligible

Very weak

Very strong

Reasonably strong

In a group on going downward, polarizability generally

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Decreases

Increases

Remains constant

Negligible

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

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

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Diethyl ether

Acetone.

Water.

Ethyl alcohol.

The strongest forces are:

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Debye froces

London dispersion

Dipole-dipole attraction

Hydrogen bonding

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

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Diethyl ether

Acetone

Water

Ethyl alochol

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

The molecules of CO_{2 in dry ice from the :}

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Ionic crystals

Coverlet crystals

Molecular crystals

Any type of crystals

A liquid on evaporation causes:

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Heating effect.

Cooling effect.

Suffocation .

All of above

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

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Sublimation

Distillation

Condensation

Evaporation

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