Question # 1

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

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Diethyl ether

Acetone

Water

Ethyl alochol

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

Force of attraction between atoms of He is

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London dispersion forces

Hydrogen bondign

Coordinate covalent bond

Covalent bond

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

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

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

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

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

Force of attraction b/w atoms of He is :

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London dispersion forces

Hydrogen bonding

Coordinate covalent bond

Covalent bond

H₂S is a gas while H₂O is a liquid at room temperature. It is due to:

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Less inter-molecular forces in water.

Covalent bonding H-O in water molecule.

Hydrogen bonding in water molecules

Ionic character in water molecules

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

Ionic solids are characterized by :

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Low meeting points

Good conductivity in solid state

High vapor 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

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

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 also 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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CaF₂

Glass

NaCL

All

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

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 intermolecular forces in liquids are

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Negligible

Very weak

Very strong

Reasonably strong

Hydrocarbon molecules with large chain lengths experience

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Weaker attractive forces

Stronger attractive forces

Repulsive forces

No attractive forces

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

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

A liquid on evaporation causes:

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Heating effect.

Cooling effect.

Suffocation .

All of above

]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

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

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Diethyl ether

Acetone.

Water.

Ethyl alcohol.

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

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 strongest forces are

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Debye forces

London dispersion forces

Dipole-dipole attraction

Hydrogen

The molecules of CO₂in dry ice from the

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Ionic crystalls

Covalent crystals

Molecular crystals

Any type of crystal

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