Question # 1

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

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

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

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

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Ionic crystals

Coverlet crystals

Molecular crystals

Any type of crystals

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

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

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Diethyl ether

Acetone

Water

Ethyl alochol

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

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

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

In a group on going downward, polarizability generally:

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Decreases

Increases

Remain constant

Negligible

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

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 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 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 of the following is a pseudo solid?

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CaF₂

Glass

NaCL

All

Force of attraction between atoms of He is

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London dispersion forces

Hydrogen bondign

Coordinate covalent bond

Covalent bond

Evaporation of water is possible at

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Above 100⁰

0⁰

100⁰

At all temperature

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

Hydrocarbon molecule with large chain lengths experience:

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Weaker attractive forces

Stronger attractive forces

Repulsive forces

No attractive 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

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 CO₂in dry ice from the

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Ionic crystalls

Covalent crystals

Molecular crystals

Any type of crystal

London dispersion forces are also called:

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Hydrogen bonding.

Debye forces

Van der Waal's forces

Instantaneous dipole-induced dipole forces.

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

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

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

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

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Decreases

Is negligible

Increases

Remains constant

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 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

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