Question # 1

Force of attraction between atoms of He is

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London dispersion forces

Hydrogen bondign

Coordinate covalent bond

Covalent bond

A liquid on evaporation causes:

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Heating effect.

Cooling effect.

Suffocation .

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

A liquid on evaporation causes

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Heating effect

Cooling effect

Suffication

All of above

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

Ionic Solids are characterized by

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Low melting points

Good conductivity in solid state

High vapour pressure

Solubility in polar solvents

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

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Ionic crystals

Coverlet crystals

Molecular crystals

Any type of crystals

Hydrogen bonding is present in one of the following pairs:

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NH₃

H₂O

HF

All of above

The molecules of CO₂in dry ice from the

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Ionic crystalls

Covalent crystals

Molecular crystals

Any type of crystal

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

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 of the following is a pseudo solid

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CaF₂

Glass

NaCl

All

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

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

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Diethyl ether

Acetone

Water

Ethyl alochol

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

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Sublimation.

Distillation.

Condensation.

Evaporation.

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

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 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

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 strongest forces are:

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Debye froces

London dispersion

Dipole-dipole attraction

Hydrogen bonding

Ionic solids are characterized by :

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Low meeting points

Good conductivity in solid state

High vapor pressure

Solubility in polar solvents

In a group on going downward, polarizability generally:

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Decreases

Increases

Remain constant

Negligible

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

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Diethyl ether

Acetone.

Water.

Ethyl alcohol.

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.

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

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Decreases

Is negligible

Increases

Remains constant

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 points

Lowering temperature only

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

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

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