Question # 1

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 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 100°C

0°C

100°C

At all temperature

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

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

Hydrocarbon molecules with large chain lengths experience

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Weaker attractive forces

Stronger attractive forces

Repulsive forces

No attractive forces

The molecules of CO₂in dry ice from the

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Ionic crystalls

Covalent crystals

Molecular crystals

Any type of crystal

The strongest forces are

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Debye forces

London dispersion forces

Dipole-dipole attraction

Hydrogen

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

London dispersion forces are alos called:

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Hydrogen bonding.

Debye forces

Van der Waal's forces

Instantaneous dipole-induced dipole forces.

In a group on going downward, polarizability generally:

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Decreases

Increases

Remain constant

Negligible

A liquid on evaporation causes

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Heating effect

Cooling effect

Suffication

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

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 of the following is a pseudo solid?

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CaF₂

Glass

NaCL

All

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

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Diethyl ether

Acetone

Water

Ethyl alochol

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

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 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

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.

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

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.

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

Hydrogen bonding is present between the molecules of

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NH₃

H₂O

HF

All of above

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

H₂S is a gas which H₂O is liquid at room temperature. it is due to

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Less intermolecular forces in water

Covalent bond in H-O in water molecule

Hydrogen bonding in water molecules

Ionic characters in water molecules

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 is a pseudo solid

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CaF₂

Glass

NaCl

All

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